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Author Topic: Motherboards: What Works w/Four or More GPUs? List Them  (Read 30883 times)
mikeo
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August 18, 2011, 12:23:08 PM
 #1

OK, catfish and I have had some bad experiences (read expensive) with motherboards that fail to support four or more GPUs even though they have five or even six PCIe slots. We want this to be a single thread info source on motherboards that have been proven to fully function with four or more cards (and those that don't).

PLEASE, use the following format:

WHAT WORKS
Motherboard Brand:
Motherboard Model & PCIe Slots:
Power Supply Brand & Model:
Number & Model GPUs:
Extender Cables w/Molex Power?:

WHAT DOESN'T WORK
Motherboard Brand:
Motherboard Model & PCIe Slots:
Power Supply Brand & Model:
Number & Model GPUs:
Extender Cables w/Molex Power?:

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August 18, 2011, 12:29:13 PM
 #2

WHAT WORKS
Motherboard Brand: Gigabyte
Motherboard Model & PCIe Slots: GA-H61M-D2H-B3 1x PCIE16x, 3x PCIE1x.
Power Supply Brand & Model: Thermaltake 775W Tough Power
Number & Model GPUs: 4x Sapphire 5850 Extreme
Extender Cables w/Molex Power?: Using Risers WITHOUT molex power

WHAT DOESNT WORK
Motherboard Brand: Gigabyte
Motherboard Model & PCIe Slots: GA-H61M-D2H-B3 1x PCIE16x, 3x PCIE1x.
Power Supply Brand & Model: Thermaltake 700w Lite Power
Number & Model GPUs: 4x Sapphire 5850 Extreme
Extender Cables w/Molex Power?: Using Risers WITHOUT molex power

700w Lite Power cannot output more than 550w, computer will hard reset.

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August 18, 2011, 12:32:23 PM
 #3

WHAT DOESN'T WORK
Motherboard Brand: MSI
Motherboard Model & PCIe slots: 890FXA-GD65, 2 x16, 4 x1
Power Supply Brand & Model: Antec HCP 1200 Gold
Number & Model GPUs: 3 5850, 2 5830
Extender Cables w/Molex Power?: 2 extenders w/molex, 3 extenders without

RMA'd this board as defective even though it WOULD support 3 GPUs with stable hashrate.

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August 18, 2011, 12:58:34 PM
 #4

WHAT SEMI-WORKS (you need Voodoo)
Motherboard Brand: Asus
Motherboard Model & PCIe Slots: P8Z68-V, 3 x16, 2 x1
Power Supply Brand & Model: Corsair GS800Cooler Master SilentPro 1000W
Number & Model GPUs: 2x 5850, 1 2x 5830, 1x 5770
Extender Cables w/Molex Power?: All x1->x16 unpowered extenders apart from single x16->x16 unpowered extender in the second (grey) x16 slot. Weird but works

This board has 5 PCIe slots, however I can't get all five recognised even with the 'X1' setting in the BIOS. Four works, and is completely stable. There is a possibility that five would work if a Molex-augmented extender is used, assuming the problem is total PCIe slot power consumption
NOTE - all 5 are now working, powered extenders are not the problem. Instead, the second x16 slot (grey) seems to *require* a full-width x16->x16 extender cable, whereas all the other slots are happy with x1->x16 extenders. Weird, since this requirement doesn't extend to the other TWO full-width x16 slots. It's sold as a 'tri-fire' capable board, but the second (middle, grey) slot seems to be 'special'... Anyway, all slots now feed cards and are mining, flat out & overclocked - and seems to be stable. I'll edit this again if I start seeing instability or frequent lockups / crashes, or the whole thing catches fire Smiley
Incidentally... there may be a way to get the magick grey slot to recognise a card in an x1->x16 extender using that 1-18 (or whatever it is) presence pin short trick. I haven't tried, mainly due to fear of shorting the wrong pins, but would make good research... bloody freakoid Asus

EDITED AGAIN - a change of PSU and shuffling around of GPUs resulted in the board not recognising some of the GPUs again. Worse still, it wasted an hour of my time by failing the POST and giving the 'no memory installed' error, when there were two sticks of RAM installed. After trying all possibilities of RAM slots, including using new RAM, it turned out to be a GPU that had failed and the RAM was fine. The board gives false error reports. I'd avoid this board at ALL COSTS, it's not worth the hassle. I've taken the CPU out and put it in another one of the boards below, which work perfectly.

WHAT WORKS
Motherboard Brand: Gigabyte
Motherboard Model & PCIe Slots: GA-H61M-D2-B3, 1 x16, 3 x1
Power Supply Brand & Model: iCute Titanium 900W (yeah, I know...)
Number & Model GPUs: 1x 5830, 3x 5770
Extender Cables w/Molex Power?: 5770s on x1->x16 unpowered risers, the 5830 chained on a x1->x1 then x1->x16 !!

This crap PSU auto-trips as soon as power draw from the cable (using a decent mains power analyser) exceeds 750W, so is NOT a 900W supply and is a scam. Hence the use of 5770s - this board was going to have a load of 5830s plugged in. However, this board is recommended since it's micro-ATX and small, but supplies proper power to all 3 of the x1 PCIe slots. All cards are overclocked and the board is completely stable - even with a daisy-chained extender to the 5830!
I've now bought 4 of these boards. They are BRILLIANT and work with every combination of GPU and PSU I've tried. My main shelf rig uses three of these logic boards. One has a Corsair 800W PSU and four 5830 GPUs. One has a Cooler Master 850W PSU, three 5850 GPUs and one 5830 GPU. The last has a Cooler Master 1000W PSU and four 6950 GPUs. Everything is rock solid - all GPUs are on extenders, and one even daisy-chains two extenders together. IMO this is the BEST BOARD for bitcoin mining if you're building your own frame rigs.

...so I give in to the rhythm, the click click clack
I'm too wasted to fight back...


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August 18, 2011, 01:36:32 PM
 #5

WHAT DOESN'T WORK
Motherboard Brand: MSI
Motherboard Model & PCIe slots: 890FXA-GD65, 2 x16, 4 x1
Power Supply Brand & Model: Antec HCP 1200 Gold
Number & Model GPUs: 3 5850, 2 5830
Extender Cables w/Molex Power?: 2 extenders w/molex, 3 extenders without

RMA'd this board as defective even though it WOULD support 3 GPUs with stable hashrate.

I was thinking of getting this board to run a 4xGPU system, but it does seem to be tricky. Found this post on this thread:

https://bitcointalk.org/index.php?topic=16474.msg264666;topicseen#msg264666

I'm using a GIGABYTE GA-890FXA-UD5 with 4x5830 and I had a fairly fun time getting it to work.  I finally managed, though, and it's running correctly with two cards plugged directly into the mobo and two on x1-to-x16 adapter riser cables (one plugged into an x1 slot on the mobo, another into an x16 slot).  The key break-through I finally had was swapping around the card configurations until all four could be seen in lspci, then running aticonig --initial --adapter=all -f one or two times with intervening reboots.  Eventually all four cards could be seen.

Of course this is in Linux (Linuxcoin booting off a USB drive with persistence, specifically), so I don't know how relevant it is to you in Windows.
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August 18, 2011, 02:03:51 PM
 #6

WHAT WORKS
Motherboard Brand: MSI
Motherboard Model & PCIe slots: 890FXA-GD70, 5 x16(2 x16, 2 x8, 1 x4), 1 x1
Power Supply Brand & Model: CORSAIR Professional Series Gold AX1200
Number & Model GPUs: 5x5850
Extender Cables w/Molex Power?: 5 extenders (x16 to x16) not powered.
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August 18, 2011, 02:08:15 PM
 #7

To be honest - it really looks as if one sure-fire 'good solution' is to build a frame rig for two micro-ATX boards, and then use two of the Gigabyte boards that both myself and kripz have found work perfectly without powered extenders. Mine cost me £60 brand new - that's less than half of the price of ANY of the 'big bang shazam whoopy-doo' gamer boards. Yes, you need twice the number of CPUs, RAM and PSUs, but most 8-card rigs will need two PSUs anyway regardless, and dedicated miners don't need much memory (on Linux, and I'm running the system off USB flashdrives, so any swapping to 'disc' would destroy performance)...

The only additional cost is having to buy two CPUs and maintain two systems. I've cancelled my order for the 890FXA-GD70 board and CPU - I was only expecting to get 6 cards onto that big ATX board, yet for the same money I can have two Gigabyte boards *with* (cheap) CPUs, and space for 8 graphics cards.

If having two micro-ATX boards isn't a problem, as opposed to one ATX or ATX-XL board, then I think we've already got a winner.

I've got lame 5770s in my Gigabyte board but kripz confirmed that it'd supply a full set of 5850 extremes - off a 775W PSU? That's bloody brilliant, and demonstrates that the board can handle the full power to each of the x1 slots too. No Molex-augmented extenders required either, nor any BIOS voodoo witchcraft - the board must consume low power too. Sounds ideal... may get two in!

kripz - have you had any power issues with all four 5850s using only a 775W PSU? Is the PSU running hot / fan racing? Do you have a wall power measurement? (sorry for any thread derailment)...

...so I give in to the rhythm, the click click clack
I'm too wasted to fight back...


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mikeo
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August 18, 2011, 02:13:27 PM
 #8

WHAT WORKS
Motherboard Brand: MSI
Motherboard Model & PCIe slots: 890FXA-GD70, 5 x16(2 x16, 2 x8, 1 x4), 1 x1
Power Supply Brand & Model: CORSAIR Professional Series Gold AX1200
Number & Model GPUs: 5x5850
Extender Cables w/Molex Power?: 5 extenders (x16 to x16)
@mike678,

Are those PCIe extenders molex powered or not?

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August 18, 2011, 02:25:44 PM
 #9

@mike678,

Are those PCIe extenders molex powered or not?
not powered I edited my original post as well.
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August 18, 2011, 06:11:10 PM
 #10

WORKS
Motherboard Brand: Biostar
Motherboard Model & PCIe Slots: A870U3 (2x16, 2x1)
Power Supply Brand & Model: Corsair TX850 (Pulling ~615W at the wall)
Number & Model GPUs: 4x Sapphire 5830 Xtreme (Overclocked & undervolted)
Extender Cables w/Molex Power?: No

Motherboard automatically unlocks 2nd core of Sempron 140.

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August 18, 2011, 10:48:58 PM
 #11

i'm just going to be lazy with my post and list which motherboards works with 4+ cards that i've personally tested. if you don't already know the motherboard, you can look up the specs

- MSI Big Bang x58
- MSI 890FXA-GD70
- Asus P7P55 WS SuperComputer
- Asus Rampage Extreme x48
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August 19, 2011, 07:08:04 AM
 #12

WORKS

Motherboard Brand: GIGABYTE
Model: GA-990FXA-UD5 AM3+ AMD 990FX SATA 6Gb/s USB 3.0 ATX AMD Motherboard
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128509

PCI Express 2.0 x16: 5 (x16, x16, x8, x4, x4)
PCI Express x1: 1

Power Supply Brand & Model: Rosewill BRONZE Series RBR1000-M 1000W
http://www.newegg.com/Product/Product.aspx?Item=N82E16817182188

Number & Model GPUs: 4 x Radeon 5830

Extender Cables w/Molex Power?: 4 Extender Cables (x16,x16,x4,x4) w/o molex.


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August 19, 2011, 09:23:50 AM
 #13

Quote
kripz - have you had any power issues with all four 5850s using only a 775W PSU? Is the PSU running hot / fan racing? Do you have a wall power measurement? (sorry for any thread derailment)...

No. Cards are at default voltage and 800/300mhz. It pulls 600w at the wall. PSU is fine and all of it is stuffed into a tub with lid with only a 14cm exhaust and intake fan. I'm using 11.6 with linux so i dont have the one core 100% cpu bug, power usage will probably be 50w or so higher with my $70 Intel G620 CPU if i did, though.

WHAT DOESNT WORK
Motherboard Brand: Gigabyte
Motherboard Model & PCIe Slots: GA-H61M-D2H-B3 1x PCIE16x, 3x PCIE1x.
Power Supply Brand & Model: Thermaltake 700w Lite Power
Number & Model GPUs: 4x Sapphire 5850 Extreme
Extender Cables w/Molex Power?: Using Risers WITHOUT molex power

700w Lite Power cannot output more than 550w, computer will hard reset.

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August 19, 2011, 02:10:30 PM
 #14

WHAT WORKS
Motherboard Brand:  ASROCK
Motherboard Model & PCIe Slots: 970 Extreme (3x16 2x1)
Power Supply Brand & Model: Antec HighPower 750 watt
Number & Model GPUs:4 x HD 6770s (various brands)
Extender Cables w/Molex Power?: 1x to 16x Extender, no Molex

Also:

MSI 890FXA-GD70 - already listed above by someone else so I won't go into details.


*Side note - Has anyone been able to get more than 4 GPUs to work with Windows XP Home 32bit?  I can get them all installed, all recognized by CCC, HWMonitor, and Trixx, even GUIMiner recognizes them, but anytime I click on "Start" for anything over 2 GPUS they never connect.... any combination of the 5 GPUs will work with just 2, but the third fourth and fifth won't show any signs of life.  If I remove any one of the 5 GPUs it will work like a charm and run without problems for weeks.  I've tried both 11.6b, 11.7, and 11.8 and nothing works with more than 4. :/
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August 20, 2011, 06:50:21 PM
 #15

WHAT WORKS
Motherboard Brand: ASROCK
Motherboard Model & PCIe Slots: 890FX Deluxe4, 3 x16, 2 x1
Power Supply Brand & Model: Antec HCP 1200 Gold
Number & Model GPUs: 4x 5850 5x 5850
Extender Cables w/Molex Power?: 1 x16 extender w/o power, 3 4 x1 w/molex power

I have a another 5850 that, although seen by the motherboard as the 5th card, was problematic and caused very unstable hashrates for all cards and several complete lock-ups. I'll revisit trying to use it later.

EDIT 8/23/11: Switched to BAMT software and tried the 5th 5850 GPU -- been working fine with 5 GPUs for 12 hours, pulling 830W and making 1850MH/s. VERY happy with BAMT! Seems one of the GPUs (not the 5th) could not sustain the 900,300 OC the other cards were comfortable with. Set that card at 875,300 and now seems stable. Easy to do with BAMT.

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August 22, 2011, 12:16:34 AM
 #16

WHAT WORKS
Motherboard Brand:  ASROCK
Motherboard Model & PCIe Slots: 970 Extreme (3x16 2x1) -> http://www.newegg.com/Product/Product.aspx?Item=N82E16813157262
Power Supply Brand & Model: 2 x Sunbeam PSU-ECO750-US-BL 750W -> http://www.newegg.com/Product/Product.aspx?Item=N82E16817709021
Number & Model GPUs: 5 x SAPPHIRE 100297-2L Radeon HD 5830 Xtreme 1GB)
Extender Cables w/Molex Power?: 3 x 16x Extenders and 2 x 1x to 16x Extenders

Running BAMT and everything is working better than expected. getting 315Mh/s per GPU at 965/300 with the phatk2 kernel.

This motherboard is a champ, just bought 10 more.  Shocked
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August 22, 2011, 11:27:39 PM
 #17

WORKS
Motherboard Brand: Biostar
Motherboard Model & PCIe Slots: A870U3 (2x16, 2x1)
Power Supply Brand & Model: Corsair TX850 (Pulling ~615W at the wall)
Number & Model GPUs: 4x Sapphire 5830 Xtreme (Overclocked & undervolted)
Extender Cables w/Molex Power?: No

Motherboard automatically unlocks 2nd core of Sempron 140.

I'm trying almost exactly the same configuration, except with 5850's and it's not stable.  Are you using 16x->16x extenders for the two 16x slots?  Have you noticed any stability issues?

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August 23, 2011, 01:14:01 AM
 #18

There no reason why any 1x PCI-e slot wouldn't work.  

You may need to do the pin mod, but other than that.  Anything work.

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August 23, 2011, 03:10:15 AM
 #19

WORKS
Motherboard Brand: Biostar
Motherboard Model & PCIe Slots: A870U3 (2x16, 2x1)
Power Supply Brand & Model: Corsair TX850 (Pulling ~615W at the wall)
Number & Model GPUs: 4x Sapphire 5830 Xtreme (Overclocked & undervolted)
Extender Cables w/Molex Power?: No

Motherboard automatically unlocks 2nd core of Sempron 140.

I'm trying almost exactly the same configuration, except with 5850's and it's not stable.  Are you using 16x->16x extenders for the two 16x slots?  Have you noticed any stability issues?

I have two 16x->16x and two 1x->16x extenders.  No pin-mod for the 1x PCI-e slots.  Rock solid stability.  Using LinuxCoin booted from 4GB USB, running headless.

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August 23, 2011, 10:50:27 PM
 #20

Thank you for this thread.

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August 23, 2011, 10:58:23 PM
 #21

WORKS
Motherboard Brand: Biostar
Motherboard Model & PCIe Slots: A870U3 (2x16, 2x1)
Power Supply Brand & Model: Corsair TX850 (Pulling ~615W at the wall)
Number & Model GPUs: 4x Sapphire 5830 Xtreme (Overclocked & undervolted)
Extender Cables w/Molex Power?: No

Motherboard automatically unlocks 2nd core of Sempron 140.

I'm trying almost exactly the same configuration, except with 5850's and it's not stable.  Are you using 16x->16x extenders for the two 16x slots?  Have you noticed any stability issues?

I have two 16x->16x and two 1x->16x extenders.  No pin-mod for the 1x PCI-e slots.  Rock solid stability.  Using LinuxCoin booted from 4GB USB, running headless.

Thanks pixilated8.  With that info, I think I've narrowed down my problem to a bad motherboard.  I'm have another one and will test 4 GPUs on it tonight, but it seems like the one I'm having trouble with has trouble even with two GPUs directly plugged on to the board.

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August 24, 2011, 01:25:38 PM
 #22

I've learned that it is VERY  important to first try a 4+ GPU rig at STOCK card clocks, then if that proves stable gradually OC each card until it becomes unstable then back off 10MH/z. Do this for each card until they are all running 24/7, in both mild and hot weather, without a problem. You will likely notice that some cards will OC very well and some will NOT. One unstable card can bring down the entire mining rig. Stability RULES!

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August 24, 2011, 08:45:46 PM
 #23

WHAT WORKS
Motherboard Brand: Gigabyte
Motherboard Model & PCIe Slots: 990XA-UD3  3 PCIe x16, 2 PCIe x1
Power Supply Brand & Model: Corsair AX1200
Number & Model GPUs: 3 x 5850 ,  1 x 5770
Extender Cables w/Molex Power?: x1-->1x-->x16 extender(w/o MOLEX power) for the 5770 card.

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August 25, 2011, 02:07:36 AM
 #24

WHAT WORKS
Motherboard Brand: Every Gigabyte/Asus/Intel x58/LGA1366 Motherboard I have tried (P6T/Reg/Green/Deluxe, Gigabyte UDx?)
Motherboard Model & PCIe Slots: (above)
Power Supply Brand & Model: Depends on cards used.
Number & Model GPUs: 4x 6870's, 4x 5770's, 4x 6950's *All matching, not tried mix/match*
Extender Cables w/Molex Power?: No Power, x1 & x16 passive cables

All of my Mining Rigs are X58/LGA1366 based setups, due to having a shit-ton of money invested into the platform anyways, Refurb Motherboards are often cheap from NCIX and 60w-80w Engineering Sample LGA1366 Xeons are dirt cheap in Dual & Quad-Core configuration.

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August 28, 2011, 10:02:55 PM
 #25

WHAT WORKS

Motherboard Brand: Biostar
Motherboard Model & PCIe Slots: A870U3; two x16, two x1
PSU Brand & Model: Thermaltake Toughpower XT 775w
Number & Model GPUs: 4x Sapphire 5850 (3 are Extreme model, one not)
Extender Cables: 3 1x --> 16x; 1 16x --> 16x (No Molex. Cables purchased from www.9mart.com)

Running linuxcoin 0.2b (old version). The only issue I had was that the cards in the x1 slots wouldn't mine initially, but rebooting solved this. All four cards are undervolted to 0.95 VDC using Atitweak. Currently getting about 300 Mhps from each card and pulling 450 watts from the wall. I haven't tuned the cards yet, and I'm sure I can get more out of them at the current voltage setting (I'm undervolting for efficiency).

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August 29, 2011, 06:24:42 AM
 #26

WORKING

Motherboard: GA-990FXA-UD7
http://www.gigabyte.com/products/product-page.aspx?pid=3880#ov
PCIe Slots: x16 * 6
Cards: 6* Powercolor 6770
Extenders: x16 -> x16

We've tried x1 -> x16 risers in that one and it was a nightmare. It can work, but be prepared for hell. Use x16 -> x16 extenders.

USB key can be really problematic with that motherboard. If you get the dreadful "Boot Error" with your USB key, update the BIOS. We've used the F4B and it worked for some. Still, we have some Linuxcoin key that don't work on it, and I really don't understand why.

Motherboard: MSi 890FX-GD70
http://www.msi.com/product/mb/890FXA-GD70.html
PCIe slots: x16 * 5, x1 * 1
Cards: 4* Sapphire reference 6950
Extenders: x16 -> x16

The PCI-E no 5(the second x16) seems dead on our motherboard. We can't do anything with it. Maybe its a bad configuration from our part...
Right now, we've put our 4 reference we had on the 4 remaining PCIe slots, and it works great. The x1 could be used. We didn't, those 4 cards are heating a lot, and we needed the extra space.

Motherboard: Biostar A870
http://www.biostar.com.tw/app/en/mb/content.php?S_ID=523
PCIe slots: x16 * 2, x1 * 2
Cards: 3 * 5770, 1 * 6950
Extenders: x1 -> x16, x16 -> x16

This board is magic. It works. Top quality board for mining.

Motherboard: ASUS M4A79T Deluxe
http://www.asus.com/Motherboards/AMD_AM3/M4A79T_Deluxe/
PCIe slots: x16 * 4
Cards: 1 * 6950, 3 * 5770
Extenders: x16 -> x16

Works great, a little costly compared to the Biostar, but it delivers.

From our experience, the Biostar come on top and will probably be our motherboard of choice from right now. And it's coming from a guy who bought FOUR GA-990FXA-UD7 with 6 cards on them. I can't understand how this board is sold at 250$ and it can't handle USB boot correctly.
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August 29, 2011, 06:53:34 AM
 #27

USB key can be really problematic with that motherboard. If you get the dreadful "Boot Error" with your USB key, update the BIOS. We've used the F4B and it worked for some. Still, we have some Linuxcoin key that don't work on it, and I really don't understand why.
...

From our experience, the Biostar come on top and will probably be our motherboard of choice from right now. And it's coming from a guy who bought FOUR GA-990FXA-UD7 with 6 cards on them. I can't understand how this board is sold at 250$ and it can't handle USB boot correctly.
I had similar problems with my GA-970A-D3. Some Gigabyte boards have this idiotic BIOS problem that apparently has to do with requiring a Windows "signature" in the boot record. I did much searching around and this is the best I could make out about this. I did find a tool that worked for me with Ubuntu. I have all Ubuntu systems here but I do have a WinXP VM under virtualbox on my notebook. I used this to format the usb key with a universal formatting tool and after that my key booted fine.

The "Universal USB Installer" is discussed here,
http://www.pendrivelinux.com/universal-usb-installer-easy-as-1-2-3/

I don't recall which forum thread I originally found out about this but it tool me many hours of trial and error to figure out this works. Apparently the HP formatter tool also works.

EDIT: Now that I think about, since this was a while back now, it may have been another tool that actually "fixed" the problem. I'm not sure right now but at the same time I also tried the "Bootice" program that did it. It's a blur now as I did this a month back in the wee hours of the morning. This program can be used to manipulate the MBR on the flash stick and if I recall you need to write a "good" MBR with this before you can boot.

http://www.pendriveapps.com/bootice-partition-flash-drive-edit-boot-sector/

Gigabyte are daft beyond words for having this boot problem and I'd seriously consider not buying their products again because of this. This was my first GA board after many years of buying only Asus.

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August 29, 2011, 07:57:31 AM
 #28

Thanks BkkCoins, we'll check into that when we get some courage for it. Currently, we're ok, it's just that the bug is incomprehensible. We've worked around 6 hours on it one night, on the verge of depression and ready to return everything when we found that updating the BIOS to F4B worked with some of our USB keys. Not all of them though (even if they all have the same OS on it).

I don't want to derail the topic, but this Gigabyte bug needs a sticky topic for it, or a wiki, or something with all the solutions people found for it. For those who buy those boards, it's really a major problem.
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August 30, 2011, 02:55:57 AM
 #29

What does not work:

Gigabyte P67A-D3-B3
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128487

While it does work with 3, it's picky about which.

Sad, since it has 5 PCI-E slots in all - quite attractive for the price if all worked.

Confirmed on multiple boards.

If a bios flash fixes, of course I will update this.

~RdD

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September 01, 2011, 03:32:31 AM
 #30

What does not work:

Gigabyte P67A-D3-B3
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128487

While it does work with 3, it's picky about which.

Sad, since it has 5 PCI-E slots in all - quite attractive for the price if all worked.

Confirmed on multiple boards.

If a bios flash fixes, of course I will update this.

~RdD



powered pci risers?

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September 06, 2011, 04:03:01 AM
 #31

Tested with powered and unpowered from cablesarus.
0, 1 and 4 work, with anything in 2 and 3 it boot loops.


I will re-test this again some time - right now the kids are all behaving, so I'm not gonna mess with them. Cool

~RdD
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September 06, 2011, 12:53:03 PM
 #32

Tested with powered and unpowered from cablesarus.
0, 1 and 4 work, with anything in 2 and 3 it boot loops.


I will re-test this again some time - right now the kids are all behaving, so I'm not gonna mess with them. Cool

~RdD


Maybe presence pins need shorting?

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September 22, 2011, 10:01:00 AM
 #33

p67 chipset only has 21 lanes.

Looking at the gigabyte website, it doesnt specifically say that the 2 16x slots will run in 8x when both are used. So assuming that it doesnt, you have 16x + 4x + 1x, we are now full. I'm guessing you could run the 2 16x slots and any of the 1x slots (total 3 cards).

Code:
1 x PCI Express x16 slot, running at x16 (PCIEX16)
 * For optimum performance, if only one PCI Express graphics card is to be installed, be sure to install it in the PCIEX16 slot.
1 x PCI Express x16 slot, running at x4 (PCIEX4)
 * When the PCIEX1_2 or PCIEX1_3 slot is populated with an expansion card, the PCIEX4 slot will operate at up to x1 mode.

If you use a 1x -> 16x riser in the 16x slot (or tape the card) i think it will work.

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September 26, 2011, 11:57:33 AM
 #34

I've come to the conclusion that the best option for dedicated miners is the Gigabyte GA-H61M-D2-B3 logic board. It's attractively priced (i.e. cheap), will take a cheap CPU and RAM but also accept a fast CPU if required later, and the four PCIe slots all work in all configurations with plain unpowered x1 -> x16 extenders.

The board seems to be pretty efficient - not wasting a ton of power internally, as proven by kripz above managing to run a quartet of 5850s from one with a 750W PSU.

On top of this, with the Sandybridge CPU installed (again, I use the cheapest one I could buy, £60 or so), it has an independent 'integrated' graphics subsystem. Lots of cheap logic boards offer this these days, so this isn't *that* special... but under Linux at least, one can boot the system with four big GPUs plugged into the PCIe slots, but configure the BIOS to use the integrated graphics first. That way, you can install, configure and run Linux off the integrated graphics, without Compiz and all the other Mac-style eye-candy getting in the way of the mining code. This doesn't even seem to use much power, either.

Obviously for you 'extreme gamers' out there who want to do some mining on the side, proper x16 connectors and triple / quad crossfire solutions on fabulously expensive 8-slot logic boards may be the order of the day. But once you go above 4 reasonable-spec mining GPUs, you really ought to be considering over 1000W PSUs, or dual PSUs.

Dual PSUs rely on your circuitry knowledge to ensure stability, and you have to also know the internal structure of each PSU to ensure that all rails are loaded to some extent (using a secondary PSU purely to power 12V loads (i.e. GPUs) leaves the 5v and 3.3v rails unloaded; in some PSUs this will instantly trip the safeties, on others the lower voltage circuitry will slowly heat up until an 'unexplained' shutdown - there are plenty of threads here about similar examples).

Single 1000W+ PSUs cost a fortune. Yes, if you're an 'extreme gamer' then you're prepared to pay large to get the best kit. But if you're building multiple dedicated miners, you don't want to be buying 'premium' kit anywhere other than where it absolutely adds hashrate.

On top of this, for packaging purposes, four GPUs is almost a sweet spot for most 'wind tunnel' type cooling systems. The board, with 4 GPUs suspended above it using extenders, fits into a cube with edges roughly the length of the logic board. This can be built into a modular system appropriate for fixing onto cheap shelving, with bathroom extractor fans at either end to channel the airflow.


There are other 4-slot boards which work well without the need for 'presence pin shorting' or any other pissing around (the Biostar board mentioned here seems a favourite), but given the PSU issue and the steep rise in price of logic boards with *more* than 4 PCIe slots, I reckon 4 is the way to go for dedicated miners.

Just my 0.0000002 BTC.

...so I give in to the rhythm, the click click clack
I'm too wasted to fight back...


BTC: 1A7HvdGGDie3P5nDpiskG8JxXT33Yu6Gct
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September 26, 2011, 01:02:42 PM
 #35

I've come to the conclusion that the best option for dedicated miners is the Gigabyte GA-H61M-D2-B3 logic board. It's attractively priced (i.e. cheap), will take a cheap CPU and RAM but also accept a fast CPU if required later, and the four PCIe slots all work in all configurations with plain unpowered x1 -> x16 extenders.

I certainly agree and for anyone having a hard time finding this board. For some reason a LOT of the searches for that model GA came up with 4 different board layouts, prices, etc etc.

But,  http://www.comeuro.net/webshop/product.php?productid=167014
Our price: £49.81 (€56.29, $74.72 )

Thank you everyone for all their work in this thread. Will try and add some of my testing soon.

If you're not excited by the idea of being an early adopter 'now', then you should come back in three or four years and either tell us "Told you it'd never work!" or join what should, by then, be a much more stable and easier-to-use system. - GA
It is being worked on by smart people. -DamienBlack
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September 26, 2011, 06:49:47 PM
 #36

WHAT WORKS

Motherboard Brand: Biostar
Motherboard Model & PCIe Slots: A870U3; two x16, two x1
PSU Brand & Model: Thermaltake Toughpower XT 775w
Number & Model GPUs: 4x Sapphire 5850 (3 are Extreme model, one not)
Extender Cables: 3 1x --> 16x; 1 16x --> 16x (No Molex. Cables purchased from www.9mart.com)

Running linuxcoin 0.2b (old version). The only issue I had was that the cards in the x1 slots wouldn't mine initially, but rebooting solved this. All four cards are undervolted to 0.95 VDC using Atitweak. Currently getting about 300 Mhps from each card and pulling 450 watts from the wall. I haven't tuned the cards yet, and I'm sure I can get more out of them at the current voltage setting (I'm undervolting for efficiency).


I have 12 A870 and A870U3 board.  Two of them cannot handle 4 GPUs.  One can handle only two and the other can handle 3.  I will be RMA'ing those and replacing them.  Of the 10 that can handle 4 GPUs, all are very solid.

My config is (2) x8->x16 in the x16 slots and (2) x1->x16 in the x1 slots.  GPUs vary but are mainly 5850's and 5830s.  PSU is 1000W Coolmax.  Running Ubuntu 11.04

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September 27, 2011, 10:05:28 AM
 #37

I've come to the conclusion that the best option for dedicated miners is the Gigabyte GA-H61M-D2-B3 logic board. It's attractively priced (i.e. cheap), will take a cheap CPU and RAM but also accept a fast CPU if required later, and the four PCIe slots all work in all configurations with plain unpowered x1 -> x16 extenders.

I certainly agree and for anyone having a hard time finding this board. For some reason a LOT of the searches for that model GA came up with 4 different board layouts, prices, etc etc.

But,  http://www.comeuro.net/webshop/product.php?productid=167014
Our price: £49.81 (€56.29, $74.72 )

Thank you everyone for all their work in this thread. Will try and add some of my testing soon.

Pair it with a celeron.

http://www.newegg.com/Product/Product.aspx?Item=N82E16819116410&Tpk=g440

Quote
Sandy Bridge Based Single-core Processing
 The Intel Celeron G440 processor includes one execution core at 1.6 GHz to provide basic computing performance at a low TDP of 35W. The innovative 32nm fabrication technology optimizes thermal performance for reduced power consumption and noise.

With graphics!

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September 27, 2011, 12:33:37 PM
 #38

MSI 890FXA-GD70 MSI 890FXA-GD70 MSI 890FXA-GD70 MSI 890FXA-GD70 MSI 890FXA-GD70

thats all you need to know.
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September 27, 2011, 03:30:41 PM
 #39

NOOOOOOOOOO to GIGABYTE 890FXA-UD7

https://bitcointalk.org/index.php?topic=38872.msg475736#msg475736
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September 28, 2011, 05:49:58 AM
 #40

a noob question, but windows still limited to 4 gpus?

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September 28, 2011, 12:50:08 PM
 #41

a noob question, but windows still limited to 4 gpus?
No.
Up to 8 GPU supports in Windows 7
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September 28, 2011, 09:44:58 PM
 #42

a noob question, but windows still limited to 4 gpus?
No.
Up to 8 GPU supports in Windows 7

I got 5 gpus to load in windows...  but the guiminer only showed 4.

1jimbitm6hAKTjKX4qurCNQubbnk2YsFw
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September 29, 2011, 02:13:50 AM
 #43

Check device manage if their is 5 GPU's.
Actually only GUIMiner can able to detect more than 4 GPU's, AOCLBF will say put card number manually. Seems CGminer also detects more than 4 GPU's.
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September 29, 2011, 05:39:26 PM
 #44

thanks for the confirmation, was freaking out that I might actually have to learn linux to run 5 gpus on a setup.

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September 29, 2011, 09:07:02 PM
 #45

Has anyone used a Gigabyte GA-970A-UD3 (not the -D3 version, but -UD3)?  Considering getting a few of those.


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October 23, 2011, 02:51:31 AM
 #46

Has anyone used a Gigabyte GA-970A-UD3 (not the -D3 version, but -UD3)?  Considering getting a few of those.



I didn't use them, but like I said earlier in this topic, if you want to boot with an USB key, this brand of motherboard can really be a pain in the ass.

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October 23, 2011, 09:29:06 PM
 #47

WHAT WORKS
Motherboard Brand: MSI
Motherboard Model & PCIe Slots: Big Bang Masrshal B3 8x PCIe x16 slots
Power Supply Brand & Model: Antec HC 1200 & Antec HP 750
Number & Model GPUs: 8x 5870
Extender Cables w/Molex Power?: 8 x16 -> x16 Risers no molex

Works in BAMT & Windows 7. LinuxCoin final periodically crashes after 15mins to 1 hour. 1550W, 124V & 15Amps at peak load 3.2GHs.

This thing is a beast but a major pain in the ass build & not recommended to anyone that isn't technically inclined or hasn't built quite a few rigs.

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February 16, 2012, 03:30:08 AM
 #48

WHAT WORKS
Motherboard Brand: EVGA
Motherboard Model & PCIe Slots: P55v/P55Sli 2 x Pci-e x16; 2 x Pci-e x1
Power Supply Brand & Model: Artesyn IBM blade server PSU 1000W
Number & Model GPUs: 2x 5970 & 2x 5830
Extender Cables w/Molex Power?: 2 x16 & 2 x1-> x16 Risers no molex

WHAT sort of WORKS
Motherboard Brand: MSI
Motherboard Model & PCIe Slots: 790FX-GD70 4 x Pci-e x16; 1 x Pci-e x1
Power Supply Brand & Model: Artesyn IBM blade server PSU 1000W
Number & Model GPUs: 2x 5970 & 2x 5830
Extender Cables w/Molex Power?: 2 x16 & 2 x1-> x16 Risers no molex
Only works if you plug 4th card to x1 Pci-e, plug it in the 4th x16 pci-e and it boot loops
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February 16, 2012, 05:03:52 AM
 #49

WHAT WORKS
Motherboard Brand: Gigabyte
Motherboard Model & PCIe Slots: GA-EP45-UD3P; 2 x16, 3 x1
Power Supply Brand & Model: OCZ ZX1250W
Number & Model GPUs: HD 5870 Reference (AMD) x5
Extender Cables w/Molex Power?: 2 x16 to x16 extenders w/o power, 3 x1 to x16 extenders with molex power

Tested and working on both Ubuntu and Debian (BAMT). Note that X output is piped to the card on the first x16 slot and basic standard output (terminal w/o X) is piped to the first card. (on an x1 slot)

-- BinaryMage -- | OTC | PGP
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February 16, 2012, 08:30:00 AM
 #50

MSI 890FXA-GD70 MSI 890FXA-GD70 MSI 890FXA-GD70 MSI 890FXA-GD70 MSI 890FXA-GD70

thats all you need to know.
Been trying to buy one off Ebay for my target 'under $100' and those suckers are always goin for 110-140, with alot of snipers. **sons-of-bitches
This board has got to be broken to sell under $100.

For Bitcoin to be a true global currency the value of BTC needs always to rise.
If BTC became the global currency & money supply = 100 Trillion then ⊅1.00 BTC = $4,761,904.76.
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February 16, 2012, 11:05:18 PM
 #51

just a suggestion, but could you make a list of the mobo's that work? Cheesy

If I've helped: 1CmguJhwW4sbtSMFsyaafikJ8jhYS61quz

Sold: 5850 to lepenguin. Quick, easy and trustworthy.
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February 17, 2012, 01:16:48 AM
 #52

No, I'm done with this thread. Some else is welcome to aggragate the info here though.

If this post tickles your fancy or helped you make more bitcoin I'll gladly take a tip:
17DWhv9f5TkRDL6kyA45qiG34d4v1QiwqE
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February 17, 2012, 01:51:43 AM
 #53

How do you determine what's working when you have conflicting reports on some boards?
P.S. Try Googling "ga h61 d2h-b3". That board does not compute.

For Bitcoin to be a true global currency the value of BTC needs always to rise.
If BTC became the global currency & money supply = 100 Trillion then ⊅1.00 BTC = $4,761,904.76.
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February 24, 2012, 10:47:48 PM
 #54

WHAT WORKS
1)
Motherboard Brand: Asus
Motherboard Model & PCIe Slots: P5Q-E, 3x PCIe x16 and 2x PCIe x1
Power Supply Brand & Model: Corsair TX850v2
Number & Model GPUs: max. 5GPUs tested so far: 3x HD 5850 1GB @ 945/280/1.088 + 1x HD 5830 800/200/0.9V + 1x HD 6770 @ 825/180/0.82V
Extender Cables w/Molex Power?: 5850s and 5830 on extenders and HD 6770 in PCIe x16 slot
none of the extenders are powered

PCIe x1 slots require shorting pins (A1-B17).

Max. 4 GPUs under 12.1, 5 GPUs (all pcie slots are used) under previous driver versions.


2)

WHAT WORKS
Motherboard Brand: Gigabyte
Motherboard Model & PCIe Slots: GA-965-S3, 1x PCIe x16 and 3x PCIe x1
Power Supply Brand & Model: Tagan TG1000-U33II 1000W
Number & Model GPUs: 3x HD 5870 between 910 and 1000/210 + 1x HD 5850 900/300 all stock voltage
Extender Cables w/Molex Power?: 5870 on normal unpowered extenders, 5850 in slot

NOTE: the x16 slot stopped working (no device in that slot gets recognized) after a few weeks and now only PCIe x1 slots work
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February 24, 2012, 10:56:11 PM
 #55

WHAT WORKS
Motherboard Brand: ASUS
Motherboard Model & PCIe Slots: P8P67 WS Platinum 1503 BIOS, 4 PCIE-16X + 3 PCIE-1X
Power Supply Brand & Model: KingWin LAZER 1050W
Number & Model GPUs: 3x 6950 + 3x 6570
Extender Cables w/Molex Power?: 3x 6950s using 1X risers, no power, 3x 6570s seated in X16 slots, no risers

All 6 GPUs recognized and mining on Windows 7 64bit @1.57GH/s, 11.12 driver (12.1 DOES NOT WORK!) 2.5 SDK.
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April 03, 2012, 10:25:00 PM
 #56

WHATS WORK
Sempron 145 ... UCC OFF
ASRock 970 Extreme 4
2GB ram + HDD 2.5" 250Gb
6970(950/340)+5870(950/300)+5850(900/300)+5870(950/300)=1590+ mhs avg...
*DEAD PSU Chieftec BPS-1200C - work <3 months
*NEW PSU Corsair AX1200
*DEAD Gigabyte 5850
*DEAD Sapphire Dual-X 7970 06-40G 1/2 fan stop
Win 7 x64 SP1

WHATS WORK
Core E4400
Gigabyte 945P-S3 rev 1.0
2Gb ram + 250Gb HDD
5870 (950/300) + 2*5850 (shit work on 900/300,350) + 5770 (950/300) = 1378 mhs avg
PSU Corsair 750WTXV2
Win 7 x64 SP1 (maybe go to BAMT in future)

Mining on : pool.itzod.ru
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April 10, 2012, 07:37:59 AM
 #57

WORKS: Gigabyte GA-990FXA-UD7 with 4x ATI 6990.

| Operating electrum.be |
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April 11, 2012, 12:59:32 PM
 #58

WHAT WORKS

MSI 785G-E53 (1 16x, 3 1x)
Tested with 4 5830s, running for 1.5 months now!.

fabrizziop @ overclock.net, Reddit, THV, steam, #bitcoin-otc, TF2WH forum
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April 13, 2012, 09:17:15 AM
 #59

Has anyone used a Gigabyte GA-970A-UD3 (not the -D3 version, but -UD3)?  Considering getting a few of those.



I didn't use them, but like I said earlier in this topic, if you want to boot with an USB key, this brand of motherboard can really be a pain in the ass.



Older post, but I will echo the words.  I have that model of mobo packaged up for return right now because it wont boot off of my USB key  (not sure if its the UD3 or D3...)
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April 13, 2012, 10:04:26 AM
 #60

WHATS WORK
Sempron 145 ... UCC ON 2 core 3ghz
ASRock 970 Extreme 4
2GB ram+250Gb 2.5" HDD
6950(70)+5870+5850+5770=1440mhs avg.....want to build 6970+5870+3*5850(or maybe 6970+2*5870+2*5850)...no money....)))
PSU Chieftec BPS-1200C open rig

Win 7 x64 SP1

I have the same board, and it does work with 4 GPUs.  I am actually running 5 on one right now.  (same CPU too)

BUT, the last two I have bought have a bunk PCIe x16 slot!  Both of the last two I bought had a bad PCIE4 slot, that is the middle x16 slot.  I have a third coming from NewEgg right now...  I hope it works, because I like this board otherwise!
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April 13, 2012, 10:21:09 AM
 #61

I have the same board, and it does work with 4 GPUs.  I am actually running 5 on one right now.  (same CPU too)

BUT, the last two I have bought have a bunk PCIe x16 slot!  Both of the last two I bought had a bad PCIE4 slot, that is the middle x16 slot.  I have a third coming from NewEgg right now...  I hope it works, because I like this board otherwise!

I've had a couple of the asrock 970 boards come a little flaky. I just bought 20 of them so I had extras when I was building out my rigs.

They also sell these boards at amazon. If you have prime, you can same of the shipping charges.

http://www.amazon.com/ASRock-MB-970EX4-970-CrossFireX-Motherboard/dp/B0058HUQJ0

If you only need 4 PCIe slots on a board, you could also check this one out as it is $30 cheaper.

http://www.newegg.com/Product/Product.aspx?Item=N82E16813157280
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April 14, 2012, 07:24:13 PM
 #62

http://www.newegg.com/Product/Product.aspx?Item=N82E16813130645&Tpk=MSI%20Z77A-G45

looks interesting, you don't see that many boards with 7 pci-e and especially not in that price bracket
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April 25, 2012, 09:15:52 AM
 #63

MSI 970a-g46 works good with 1x to 16x extenders
4 5850 sapphire about 480 watts with undervolted sempron

Anyone know how to get 1x working MSI 990XA-GD55 I've tried the pin shorting trick and added a molex adapter.

Asrock 970 Extreme3 I can only get one of the 1x slots working with extender so just 3 slots with this one
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April 30, 2012, 03:20:19 AM
 #64

Asrock p67 extreme 4 3-16x 2-1x 5 total all work
ABit IL8 Intel 945P ICH7 1-16x 3-1x 4 total all work
Gigabyte p35-ds3l 1-16x 3-1x 4 total, all work however this board will not boot into bamt but I do have it running ubuntu 11.04
I'm using 16x-16x and 1x-1x extenders in their respective slots in all the above

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April 30, 2012, 05:47:02 PM
 #65

WHAT WORKS
Motherboard Brand: ECS
Motherboard Model & PCIe Slots:  A885GM-A2, four 16x, two 1x
Power Supply Brand & Model: One Antec 750, one Antec 500, one Ultra 600
Number & Model GPUs: four 5870s, two XFX, one Sapphire, one ATI
Extender Cables w/Molex Power?: two 16->16, two 1->16, no molex power

Note: the 750 is powering two 5870s and the MB and HDD, the 500 and 600 each have one 5870 of their own.  I'll be putting them on a new Antex 620 in the near future.  Using customer external setup, with a normal box fan blowing on it.  The 500 and 600s use a paperclip power on switch. Smiley


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May 02, 2012, 04:37:52 AM
 #66

MSI 970a-g46 works good with 1x to 16x extenders
4 5850 sapphire about 480 watts with undervolted sempron

Anyone know how to get 1x working MSI 990XA-GD55 I've tried the pin shorting trick and added a molex adapter.

Asrock 970 Extreme3 I can only get one of the 1x slots working with extender so just 3 slots with this one

Sounds like you may have a bad motherboard. I've had no problems getting both 1x slots working with that motherboard.

I have 7 rigs running 4 x 7970 with the Asrock 970 Extreme3. It's a great motherboard and inexpensive. You can pick it up for $79.9 at newegg.com. You will need two 1x to 16x risers and a custom shelf to hold the two cards on the risers.

I've had a lot of issues with Gigabyte and MSI motherboards and have found Asrock to be better and cheaper.
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June 18, 2012, 01:18:36 PM
 #67

What Works:

Motherboard: MSI-790FX-GD70
Power Supply Brand & Model: OCZ ZX 1250 Watt modular Power Supply
Number & Model GPUs: four 5850s... now 3 5850 + 1 5970
Extender Cables w/Molex Power?: none, but you can do them since 4x 5850 runs really hot and if you OC prepare to have brunt out fans in a few months, on 70+% speed for 24/7. I added spacers inbetween the card ends to get air in. I suggest a spot fan or a extra fan blowing on these also, drops temps 10-15 degrees.




 

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June 22, 2012, 10:28:17 AM
 #68

I am going to be very precise here because there are other post on this Forum that say these boards work with more than 4 Cards and that is why I bought two of these F--cking things.

Both the Gigabyte boards I have, as listed below behave in the same manner.


Does not Work

Gigabyte 990FXA-UD5 V1.1 (Bios‘s F5 to F8) (MB Ser. No’s 115100014366 & 115100014364)
4 GB Ram 1333Mhz (1 Stick)
AMD X2 260
Corsair 1200W
80Gb HDD
Xubuntu 11.04 - 64 bit
Drivers 11.6
SDK 2.4

Does not ever see more than 3 Cards. (lspci, aticonfig --lsa)
Will run 3 Cards direct off  PCIE x 16_1 , PCIE x 16_2 , PCIE x 8 These are the only slots you can populate using double width cards inserted directly into the slots.
Will NOT run the same cards on the same slots when connected with 16 x 16 extender (Powered or un-powered)
Will run same cards and extenders in PCIE x 16_1 , PCIE x 4_1 , PCIE x 4_2
(appears to be a Latency issue, no adjustment for PCIE Latency available in Bios’s listed above)

Shorting presence pins, 1 x 4 extenders, etc etc, nothing seems to work.

_________________________________________________________________________


Does Work

MSI 990FXA-GD80   (MS-7644 V2.2)  (Bios E7640AMS V11.5)
4 GB Ram 1333Mhz  (1 Stick)
AMD X2 260
Corsair 1200W
80Gb HDD
Xubuntu 11.04 - 64 Bit
Drivers 11.6
SDK 2.4

All physically exactly the same components as above on the Gigabyte 990FXA-UD5 V1.1 board except the Motherboard changed to the MSI 990FXA-GD80 board.

4 Cards (AMD 5850) on 16 x 16 extenders (un-powered) connected into all four PCIE 16 way slots on the board. No presence jumpers.  

Changes required:- PCIE Latency set to 96 in Bios.

All cards recognised immediately after boot by:- sudo aticonfig --lsa

Less than one hour after walking thru my front door with the MSI board I was mining on 4 Cards @ 393 M/H on all cards, exactly the Hash rate I was getting per card with 3 Cards on the Gigabyte board
                                                           --------------------------------------------------
Edit:- now 1 day later, I have 5 x 5850's mining on the board. Fifth card is on slot marked as PCI_E3 using 1 x 4 Extender (Powered) and A1 jumpered to B17 on the Slot. Same routine as before, recognised by "sudo aticonfig --lsa" immediately after boot. no screwing around!
                                                           ---------------------------------------------------
So, if you are a Noob, and you have a deeply masochistic streak, you obtain real gratification from hours of self flagellation and stress, then the Gigabyte 990FXA-UD5 V1.1 is tailor made for you.      
On the other hand, if you want something that simply works “out of the box” spend the extra bucks and buy the  MSI 990FXA-GD80   (MS-7644 V2.2) In fact buy anything other than a Gigabyte board even if you simply want reliable USB Boot!
With the benefit of 20/20 hindsight, having bought the two Gigabyte 990FXA-UD5 V1.1 in January and since spent 100‘s of hrs searching for remedies. While all the time 25% of my Hash power is un-usable sitting in the cupboard and 50% of the remaining hash power is off-line about 3-4 hrs a day while I try unsuccessfully, various fixes to make the Gigabyte board see more than 3 cards.

The extra bucks is something I would have paid happily!


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June 25, 2012, 11:29:28 AM
 #69

WHATS WORK
Sempron 145 ... UCC ON 2 core 3ghz
ASRock 970 Extreme 4
2GB ram+250Gb 2.5" HDD
6950(70)+5870+5850+5770=1440mhs avg.....want to build 6970+5870+3*5850(or maybe 6970+2*5870+2*5850)...no money....)))
PSU Chieftec BPS-1200C open rig

Win 7 x64 SP1

I have the same board, and it does work with 4 GPUs.  I am actually running 5 on one right now.  (same CPU too)

BUT, the last two I have bought have a bunk PCIe x16 slot!  Both of the last two I bought had a bad PCIE4 slot, that is the middle x16 slot.  I have a third coming from NewEgg right now...  I hope it works, because I like this board otherwise!

Are you plugging cards direct into the slots or using a riser? Also some boards are really picky and insist certain cards be plugged in certain slots, complaining that you need to populate certain slots first to enable crossfire/SLI, and refuse to boot further unless you do what it tells you to do.

Anyways, if you are using risers, you will probably need to short PCI-E presence pins. also make sure your risers arent defective or broken. Bending them a lot or plugging them in/unplugging a lot is very stressful on risers and can break the delicate solder points for the wires unless both ends are 1x physical width, which makes them effortless to plug in/unplug

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June 29, 2012, 12:27:15 PM
 #70

Asus f1a75-m le works with four (going to try a fifth in a few weeks when I get my pci-to-pcie adapter for my puny 5570). The four includes the APU. Only had luck with these in Linux, in Windows I only get two adapters. Running BAMT. Force onboard video. Running dual power supplies. Running w/out molex extenders, and did not need shorting for the 1x pcie adapter cable.

A6-3500 + 5850 + 5850 + 7970 for 1100 MH/s. (Bad performance due to driver/SDK because of the 7970).

EDIT: Typo
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June 29, 2012, 12:29:47 PM
 #71

Gigabyte 965P-DQ6 - Can't use the bottom x16 slot as it disables the 3 x1 slots... Everything worked once I figured that out. 2x 6950's and 2x 6870's

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June 29, 2012, 12:31:48 PM
 #72

Asus f1a75-m le works with four (going to try a fifth in a few weeks when I get my pci-to-pcie adapter for my puny 5570). The four includes the APU. Only had luck with these in Linux, in Windows I only get two adapters. Running BAMT. Force onboard video. Running dual power supplies. Running w/out molex extenders, and did not need shorting for the 1x pcie adapter cable.

A6-3500 + 5850 + 5850 + 7990 for 1100 MH/s. (Bad performance due to driver/SDK because of the 7990).


AFAIK that has not been released yet.

How on earth do you have one ?

Please share a picture because I am dying to see my next mining cards !
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June 29, 2012, 01:57:39 PM
 #73

Sorry, that was a typo.
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July 05, 2012, 08:29:42 PM
 #74

WHAT WORKS
Motherboard Brand: Gigabyte
Motherboard Model & PCIe Slots: GA-MA790FXT-UD5P 2x16, 3x1
Power Supply Brand & Model: Dual PSU setup
Number & Model GPUs: 2x5870, 1x5850, 2x 5830
Extender Cables w/Molex Power?: Extenders yes, Powered no.
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July 06, 2012, 12:58:54 AM
 #75

WHAT WORKS
Motherboard Brand:MSI
Motherboard Model & PCIe Slots:big bang xpower 2. 7 pci express. 3x16 4x8
Power Supply Brand & Model: corsair hx 1000, upgraded to fsp aurum pro 1200
Number & Model GPUs:5 5870
Extender Cables w/Molex Power?:direct. Used 6 with x16 plain extenders to test. Ok too.
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July 18, 2012, 10:11:04 AM
 #76

WHAT WORKS
Motherboard Brand: Asus
Motherboard Model & PCIe Slots: F1A75-M LE - 2x PCIe 16x, 1x PCIe 1x, 1x PCI
Power Supply & Brand: MIST 400w & HP 475W
Number & Model GPUs: A6-3500 + 2x 5850 + 7970 + 5570
Extender Cables w/Molex Power?: One 1x-to-16x w/Molex for the PCI to PCIE adapter, one 1x to 16x extender, and one 16x extender.

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April 23, 2013, 12:05:04 AM
 #77

Anyone want to update this?  I'm looking for a good mb to put four ATI 7950s in...

Thanks

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April 23, 2013, 01:42:22 AM
 #78

Hello
WORKS:

Gigabyte GA-970A-D3, sempron 145, 1x 4GB DDR3, 1x HDD, Sentey 750W 80+ PFC  PSU

4x Sapphire 7850 1GDDR5 (dual cooler)

2 cards running on 16x powered risers (works with and without power)

2 cards running on 1x to 16x powered risers (only works with power) on 1x slots 2 and 3.

image:

Win7 x64 and GUIMiner BTC
This thing eats 440W from the AC outlet, and produces 1GH on BTC
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April 23, 2013, 04:07:53 AM
 #79

Hello
WORKS:

Gigabyte GA-970A-D3, sempron 145, 1x 4GB DDR3, 1x HDD, Sentey 750W 80+ PFC  PSU

4x Sapphire 7850 1GDDR5 (dual cooler)

2 cards running on 16x powered risers (works with and without power)

2 cards running on 1x to 16x powered risers (only works with power) on 1x slots 2 and 3.

image:

Win7 x64 and GUIMiner BTC
This thing eats 440W from the AC outlet, and produces 1GH on BTC


Did you make that housing yourself? I like it, clean and space efficient. I wish I had tools to make my own.
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April 23, 2013, 10:39:44 AM
 #80

Hi, yes I did it myself, it was time consuming to do it but I wanted something really strong, that I could fit in a rack later (its 44 cm wide for a reason Cheesy ) and, if I need it, dissasemble entirely with ease (the entire case is screwed in the aluminium directly).
I cut the parts with a bench circular saw (from a friend, I don't own one, the only thing I have is a small bench black & decker driller machine) that was it.
I'm building the second one right now Smiley
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April 23, 2013, 08:38:40 PM
 #81

Hi, yes I did it myself, it was time consuming to do it but I wanted something really strong, that I could fit in a rack later (its 44 cm wide for a reason Cheesy ) and, if I need it, dissasemble entirely with ease (the entire case is screwed in the aluminium directly).
I cut the parts with a bench circular saw (from a friend, I don't own one, the only thing I have is a small bench black & decker driller machine) that was it.
I'm building the second one right now Smiley

Take pictures and write up a walk-through, please! :-)
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April 24, 2013, 07:21:28 PM
 #82

With 4 7950s you should be making >2gh/s
?
Why only 1gh/s

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April 24, 2013, 07:58:07 PM
 #83

With 4 7950s you should be making >2gh/s
?
Why only 1gh/s

Well..., I already had 2x 7850 I used with hashcat a lot, so I decide for this first miner stick with those cards, so I bought 2 more identical ones.

I'm building the next rig, they will have 2x 7950 now Cheesy (and 4 x 7950 when I bought another PSU)

and I want to compare power consumption vs production because my measures doesn't match what I have read on the forum, so I will have to test both combinations and see which ones are more power efficient.

Money is about the same because 7850 costs half the 7950's.
will do the tests and post here this weekend (if my cards arrive on time Cheesy )

Quote from: Marrs
Take pictures and write up a walk-through, please! :-)

Sure, give me time I will prepare something and post here.
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April 24, 2013, 08:35:13 PM
 #84

I'm starting to re-think the 4gpu on one motherboard scenario...

Based on pricing for mb/psu...would you recommend just buying two mb/cpu/psu (750w) and just building two systems instead of one?

I don't mind the extra work I just want to make sure and get the most performance out of them and it's starting to seem like putting more gpus on a single mb makes me have to cool them alot harder as well as the components being a lot more costly than components for 2/mb...

opinion?



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April 25, 2013, 01:58:12 AM
 #85

Hello
I don't think I am in a position to recommend you, I have been mining for only 1 month, this miner is the first one fully assembled by me (although I have 2 more (just 5830 on a small motherboard over a cardboard box Cheesy which I use for testing because they are not cost effective (consumes too much power)).

That aside, I think that you should think what weights more for you, MH/s vs Power consumption or MH/s vs Hardware cost.

In my case is the first, because, for now, power cost is something I will have all the time, hardware is something I buy and I can use for other things besides mining, so I still have to test the performance of two 7950 vs four 7850 to tell you more precisely what is best in terms of power usage vs MH/s

However I will, in the end assemble 4 to 5 GPU per rig, because I think it's more power efficient, but still don't know which cards will I use.

the power consumption of the motherboard, processor and hard drive is quite significant, so the more GPU per computer the better, IMHO.
please if someone with more experience than me think different, comment, i will love to hear your educated point of view.
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April 25, 2013, 01:13:38 PM
 #86

Still not clear to me. Is there a motherboard which can support  4 x HD7950 without having to short A1-B17 pin?
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April 25, 2013, 09:49:30 PM
 #87

Hi,

does anyone have any feedback on?

   
GA-H61M-D2-B3
http://www.gigabyte.com/products/product-page.aspx?pid=3773#ov

4 Slots.. should hold 4 cards

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April 26, 2013, 03:25:08 AM
 #88

Still not clear to me. Is there a motherboard which can support  4 x HD7950 without having to short A1-B17 pin?
I am using Gigabyte GA 970A-D3 motherboards, has 5 PCI-E ports (one 16x, one 4x (with 16x size) and three 1x), I'm using 4 cards on this mobo, and no jumper necessary, but I'm using cablesaurus powered extender cables, they are not cheap but works perfectly.
but this is under windows 7 x64, I still haven't tested under linux, booting from USB which is my finally goal.
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April 26, 2013, 01:10:17 PM
 #89

WHAT WORKS
Motherboard Brand: Gigabyte
Motherboard Model & PCIe Slots: 990 FXA-UD3
Power Supply Brand & Model: FSP Aurum Pro 1200W
Number & Model GPUs: 4 x 6950 (1 each of ASUS, XFX, MSI and Sapphire)
Extender Cables w/Molex Power? 1 x PCIE 16x extender and 3 x PCIE x16 to x1 extenders.  No molex power extenders.

Tried a 5th 6950 (XFX) but it wouldn't work.  The MB has 6x PCIE slots total, would have been nice...

https://bitcointalk.org/index.php?topic=7216.msg1950922#msg1950922

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April 26, 2013, 01:28:07 PM
 #90

WHAT WORKS
Motherboard Brand: Gigabyte
Motherboard Model & PCIe Slots: 990 FXA-UD3
Power Supply Brand & Model: FSP Aurum Pro 1200W
Number & Model GPUs: 4 x 6950 (1 each of ASUS, XFX, MSI and Sapphire)
Extender Cables w/Molex Power? 1 x PCIE 16x extender and 3 x PCIE x16 to x1 extenders.  No molex power extenders.

Tried a 5th 6950 (XFX) but it wouldn't work.  The MB has 6x PCIE slots total, would have been nice...

https://bitcointalk.org/index.php?topic=7216.msg1950922#msg1950922
Can you try connecting the 5th & 6th slot using 16x extender cable with molex connector?

Gigabyte 890FXA-UD7, has 6 slots, but so far i can make it to work in only FOUR cards, but with different slots which confuses me.
Yesterday i can able to connect 3 cards using 16x extender cable WITHOUT molex connector in 16x_1, 16x_2, 8x_2 & i hope i can make it work in 8x_1 slot also using 16x extender cable(which i don't have).

But this is opposite to me due to this https://bitcointalk.org/index.php?topic=38872.msg475736#msg475736
Here i used 16x & 4x slot, instead of yesterday 16x & 8x.

I hope maybe with 16x extender cable with/without molex can make this board to use all the 6 slots
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April 27, 2013, 01:48:44 AM
 #91

I don't have any of the extender cables with a molex connector, I'd never heard of them when I ordered my parts. Do you plug your power supply into them to boost the PCIE power?
I guess it could help when running a lot of cards.
Maybe it can work with more than 4 cards... Smiley

I busted one of the PCIE slots and bent one of the pins (the TCK one I think), is it important?  Otherwise I only have 5 slots that work.

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April 27, 2013, 06:06:10 AM
 #92

Yes, cables with molex to boost power to pci-e.
Mother boards are designed with the idea to play games, watch in high definition.....
Its not designed to run 100% 24/7 to mine.
http://cablesaurus.com/PCIe-x16-Extender-Cable-w-Molex-Connector

I don't know what you saying by TCK, maybe a pic will be better to show busted slot & bent pin.
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April 27, 2013, 12:07:33 PM
 #93

Ok thanks.

See pinout here for the TCK pin: http://en.wikipedia.org/wiki/PCI_Express

I pulled out one of my cards and the PICE slot came with it Smiley

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April 27, 2013, 12:31:24 PM
 #94

thats bad.
Try connecting 5 cards using FIVE 16x extender cables, then see windows detects 5 cards or not.
If windows detects then its good.
If windows detects only 4 card, then that board can accept 4 cards only.
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April 30, 2013, 01:59:09 PM
 #95

I don't have 5 x16 extenders, I only have 1 and I can't really be bothered ordering more as I've got plenty of x1's and it seems to (mostly) work.  My 5th card is just in my everyday pc for now, I just have to start and stop mining when I use it. Thanks though.

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April 30, 2013, 06:12:19 PM
 #96

WORKS
Motherboard Brand: Biostar
Motherboard Model & PCIe Slots: A870U3 (2x16, 2x1)
Power Supply Brand & Model: Corsair TX850 (Pulling ~615W at the wall)
Number & Model GPUs: 4x Sapphire 5830 Xtreme (Overclocked & undervolted)
Extender Cables w/Molex Power?: No

Motherboard automatically unlocks 2nd core of Sempron 140.
I have a mix of 5870 and 5850, overclocked, no voltage change. the mobo fried up within a few weeks.

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April 30, 2013, 06:14:42 PM
 #97

I've learned that it is VERY  important to first try a 4+ GPU rig at STOCK card clocks, then if that proves stable gradually OC each card until it becomes unstable then back off 10MH/z. Do this for each card until they are all running 24/7, in both mild and hot weather, without a problem. You will likely notice that some cards will OC very well and some will NOT. One unstable card can bring down the entire mining rig. Stability RULES!
Yes, especially with multiple rigs. I have mine all running stock speed and stock voltage.

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May 02, 2013, 01:43:39 AM
 #98

Does anyone know if the Asrock970 extreme 4 will work with 5 gpus's in a win 64 enviro easily?

http://www.newegg.com/Product/Product.aspx?Item=N82E16813157262
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May 10, 2013, 05:28:56 PM
 #99

Does anyone know if the Asrock970 extreme 4 will work with 5 gpus's in a win 64 enviro easily?

http://www.newegg.com/Product/Product.aspx?Item=N82E16813157262



I dont know about Windows but that mobo is listed on the BAMT hardware compatibility list as working with 5 GPUs.

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May 10, 2013, 05:32:57 PM
 #100

WHAT WORKS

Motherboard Brand: Gigabyte
Motherboard Model & PCIe Slots: GA-970A-D3; two X16, 3 X1
PSU Brand & Model: Silverstone 1200W SST-ST1200-G Evolution
Number & Model GPUs: 4x Sapphire 7950 21196-00-20G Boost Models
Extender Cables: 2 X16 extenders, 2 1X to 16X adapters, works unpowered or powered


tried to put 5 th card in wont finish booting.  NOT the boot problem other Gigabyte boards have.  It will boot it just locks up.  Tried underclocking cards.
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May 11, 2013, 12:56:44 PM
 #101

WHAT DON'T WORK:

ASUS M4N75TD with PCIe Powered risers (in the 16x ports and in the 1x ports)

If I connect the molex, the motherboard doesn't even post.
If I did NOT connect the molex, the motherboard sometimes works, sometimes it doesn't start.

same behavior with 16 to 16x extenders that with 1x to 16x extenders.
tested with Sapphire 7950´s

this mobo doesn't like extenders Sad

WHAT WORKS:
Curious, the cheap Gigabyte 78LMT-S2 motherboard works with 2x 7950 using: 1x 16x to 16x powered riser, and 1x  1x to 16x powered riser.

Interesting option as this motherboard is really really cheap, and for 2x 7950 is not a bad choice!!

However, comparing it with the Gigabyte 970A-D3 the performance is lower.
What I mean, is that in widows 7, the second card (in the 1x connector) is about 80% load, not more, ever, and with the bigger mother 970A-D3 load is 99% in every slot, probably has to do with limited bandwidth of the 78LMT-S2 , dunno.
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May 22, 2013, 12:53:05 PM
 #102

MSI 970a-g46 works good with 1x to 16x extenders
4 5850 sapphire about 480 watts with undervolted sempron

Anyone know how to get 1x working MSI 990XA-GD55 I've tried the pin shorting trick and added a molex adapter.

Asrock 970 Extreme3 I can only get one of the 1x slots working with extender so just 3 slots with this one

I have the same problem with MSI 990XA-GD55.
did you succeed somehow?
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May 28, 2013, 04:32:55 PM
 #103

WHAT WORKS

Motherboard Brand: Gigabyte
Motherboard Model & PCIe Slots: GA-970A-D3; two X16, 3 X1
PSU Brand & Model: Silverstone 1200W SST-ST1200-G Evolution
Number & Model GPUs: 4x Sapphire 7950 21196-00-20G Boost Models
Extender Cables: 2 X16 extenders, 2 1X to 16X adapters, works unpowered or powered


tried to put 5 th card in wont finish booting.  NOT the boot problem other Gigabyte boards have.  It will boot it just locks up.  Tried underclocking cards.


How do you use a PSU Brand & Model: Silverstone 1200W SST-ST1200-G Evolution to power up 4 GPUs? , it only has 4 pcie slots and each of your cards take 2 slots each right?
could anyone answer this? im building a rig with the problem of finding a psu that supports 4 gpus

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May 28, 2013, 05:40:57 PM
 #104

A lot of cards (for example, Gigabyte HD7950) come with a 2xMolex->PCIe6 and a 2xMolex->PCIe8 adapter, in case your PSU doesn't have the proper cabling. In that case, you can string your PSU 4 PCIe8 to each of those video cards, then split up your separate molex arms and run them with the PCIe6 adapters.... 4 cards, 2 molex needed for each to supply a PCIe6.... Most PSUs have 6 or 8 molex connectors.

WHAT WORKS

Motherboard Brand: Gigabyte
Motherboard Model & PCIe Slots: GA-970A-D3; two X16, 3 X1
PSU Brand & Model: Silverstone 1200W SST-ST1200-G Evolution
Number & Model GPUs: 4x Sapphire 7950 21196-00-20G Boost Models
Extender Cables: 2 X16 extenders, 2 1X to 16X adapters, works unpowered or powered


tried to put 5 th card in wont finish booting.  NOT the boot problem other Gigabyte boards have.  It will boot it just locks up.  Tried underclocking cards.


How do you use a PSU Brand & Model: Silverstone 1200W SST-ST1200-G Evolution to power up 4 GPUs? , it only has 4 pcie slots and each of your cards take 2 slots each right?
could anyone answer this? im building a rig with the problem of finding a psu that supports 4 gpus
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November 27, 2013, 04:08:45 PM
 #105

asus m2npv-vm
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November 29, 2013, 10:45:07 AM
 #106

How much 7990 work with Gigabyte GA-990FXA-UD7?

4 GPU picture

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