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The "ground" is all the same, for everything. You are getting ground from the PCIe pins, and also from the 6-8pins above. (Thus the two extra ground wires in the 8-pin, which are just the two from the 6-pin, shared.)
That is the "common" = "-12,-5,-3,-1.5" all in one. Also the "Frame" and anything-else metal in the computer.
The "ground" is all the same, for everything. You are getting ground from the PCIe pins, and also from the 6-8pins above. (Thus the two extra ground wires in the 8-pin, which are just the two from the 6-pin, shared.)
That is the "common" = "-12,-5,-3,-1.5" all in one. Also the "Frame" and anything-else metal in the computer.
That is fine if you use a single psu. ground is ground is ground. makes no odds, and the slots are spec'd high enough on most mbs to happily allow 75 watts grounded into the socket without issues. However, my situation is a little different: I use a 250 watt seasonic to power the motherboard and pci-e slots. the psu has 22amps on the 12v. I use a 750 watt seasonic psu to power the cards. In my 4 slot motherboards (4 x 16) Whith these motherboards I use a slightly higher spec psu (again a seasonic,14a and 15a over two rails) I am using underclocked semperons A very small ubuntu install (copied from bamt) Now no matter what psu I use for the motherboard, slot 4 never gets enough juice if all 4 slots are full. (hashrate is normally rocksold 492.1) add a 4th card in slot 2 (0-3) this now hashes full speed and the 4th card jumps between 390 and 441. So I need a powered riser. But I need to connect the grounds up on the riser, I cannot risk the 750 watt psu grounding into the 250. Do the 12v and 3v have different grounds? (there are 3 ground on the front notch) is each ground for something else? I guess it wont take too long to workout, an inline multimeter should do the trick. I only have two old cards though, still hopefully it wont blow the card. Does this sound reasonable? do you know anyone who has a schematic for a card with ground connected on the riser. in the pic on cablesaurus it looks like B4 and or B7 leaving out A4. although B4 and A4 makes slightly more sense, but this is just guesswork. am I trying to fix an nonproblem (letting the card ground from teh 750 into the 250 - every fibre of my being says no)
cheers steve IMHO if they are both connected to the same outlet / extension cord then it shouldn't be any problem but I would like somebody else to chime in here and confirm because I am no expert. Just what I have heard on the forum regarding multiple PSUs and one GPU being powered from 2 diff PSUs. |
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Except the complaint above is somewhat legitimate since tuning in Linux is widely known not to be quite the same quality as windows and I don't think anyone in there right mind would argue that windows offers much better support for gaming at this time(although that's slowly changing).
Gaming... ?  I was strictly speaking about mining issues. What is difficult to tune? There are two major limitations (for 7XXX): You cannot alter the voltage or set memory clock more than 150 Mhz lower compared with the GPU clock. (both issues can be fixed with a BIOS flash, although the 7xxx bios editing is not quite straightforward) Other than that you can tune pretty much everything else I can think of. Back to Windows, so I read about Windows 8 being able to work with 5 7XXX cards using 13.1. Can you try that? How about monitoring VRM temps? I heard that cannot be done on linux either. maybe you found a solution and can help us by sharing it? thanks! |
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Hey guys quick question, i'm using the xfx 7970 double d edition. stock 925/1375
My question, from doing my research online it appears xfx no longer use the reference pcb in these cards, cost saving, so the pcb isn't AMD any more. Would it be safe to flash the bios mentioned in this thread?
I'm struggling to get 550kh/s out of it at 1025/1375
what can go wrong if you got the dual bios switch? |
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So what happened now?
13.4 drivers are again limiting to 6 only?
it is impossible to do four 5970s now with newer drivers?
thx!
this thread has nothing to do with 5970's. open a new thread. It shouldn't matter, really. I don't want to open a new thread. I am thinking of a similar setup with 6 or 7 7970s but I am still confused how to go about it without windows 8. this thread is still on topic, i think. i hate metro UI so that is why i am reluctant to try w8. |
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How about the 3.3 volt rails?
do they also need to be modified?
how much is the power draw on the 3.3volt rail?
what is 3.3 volt used for anyway?
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So what happened now?
13.4 drivers are again limiting to 6 only?
it is impossible to do four 5970s now with newer drivers?
thx!
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Now this is really confusing.
I understood from WAY back that now windows is limited to 8 GPU by amd driver.
Now it is 4 again? linux is still 8? i am confused.
Windows is not limited to 4, it's the combination of Drivers and Windows. For some reason they just don't play together well and I'm guessing AMD never coded their drivers efficiently for 6 Video Cards since who has that many, lol. 8 GPU in windows is surely possible.I saw some guy running four 5970 cards without problem on windows 7 x64. maybe later drivers like 13.1 took this possibility away?? |
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Now this is really confusing.
I understood from WAY back that now windows is limited to 8 GPU by amd driver.
Now it is 4 again? linux is still 8? i am confused.
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No need to TeamViewer session this. Here is my example config for a 7970 and two 5830's for mining scrypt based alt-coins. This is on the verge of stability. You should be able to gather enough from this to get your own config going. Read the README's in cgminer documentation. Look at every variable. I have this really tweaked, so you may not necessarily want some of the values I have below such as fan speeds, temp target, etc. {
"pools" : [
{
"url" : "p2pool.org:9388",
"user" : "xxxxxxxxxxxxxx",
"pass" : "xxxxxxxxxxxxxx"
},
{
"url" : "127.0.0.1:8108",
"user" : "xxxxxxxxxxxxxx",
"pass" : "xxxxxxxxxxxxxx"
}
]
,
"intensity" : "13,15,15",
"shaders" : "2048,1120,1120",
"gpu-engine" : "1170,955,935",
"gpu-fan" : "55-88,50-85,50-85",
"auto-fan" : true,
"gpu-memclock" : "1700,1175,1150",
"gpu-powertune" : "20,20,20",
"temp-cutoff" : "95,95,95",
"temp-overheat" : "85,85,85",
"temp-target" : "77,77,77",
"api-port" : "4028",
"expiry" : "1",
"gpu-dyninterval" : "7",
"gpu-platform" : "0",
"gpu-threads" : "1",
"hotplug" : "5",
"log" : "5",
"no-pool-disable" : true,
"queue" : "0",
"scan-time" : "1",
"temp-hysteresis" : "3",
"shares" : "0",
"kernel-path" : "/usr/local/bin"
}
How many KH/s from the 7970? Also what OS, SDK and driver? thx! |
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Some pictures for help: The A side is the back side of the card (solder side) with the two 12V pins and the presence (PRSNT1#) pin.  The B side is the front side of the card (with the bulk of the components) with the three 12V pins in a row.  Thanks for the guide BTW. I can confirm this works nicely. Is the 3.3 volt power draw much to warrant cutting these and wiring them to the PSU separately avoiding the mobo? |
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I hear reviews saying that the Ati control panel is bugged with lucid logix virtu mvp software but if you use nvidia you can access its control panel fine. no reviews i have found mention losing hardware monitoring..
I currently have the whole virtu software off mode, plugged into the ati card and monitoring temps now fine its just i want to use the onboard igpu that my intel cpu has as it plays games decent, surfs web everything smooth while i can crank 13 intensity on my ati card mining full blast ahead..
im sure we can get it working but have to try different bios configs with primary adaptor, multimonitor option in bios etc.
i dont use a dummy plug no. maybie ill try that and see if i can gain my monitoring of the card while usin igpu too.
Definately try getting a dummy plug and keep us posted. I think maybe it is something to do with buggy intel drivers? |
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Very strange. For some it works while for others it doesn't?
I would like to know why this difference as I am planning a similar build and don't want to end up unable to monitor my temps/change my clocks.
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wondering if OP got it working..
please let us know
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Yea, get rid of lucid logix, you don't need it. Make sure UEFI is set for the intels IGP. You need a dummy plug for the AMD card. Monitor plugged into the IGP port.
In my thread above, I was just testing that piece of crap software, turned out it's a piece of crap. Uninstall lucid logix.
Edit:
I'm actually mining away with two 5850's now, on litecoin. Prior was one 5850 and mining bitcoin, I believe.
so did you manage to get this setup working with cgminer being able to adjust temps and clocks on the amd radeon card? how come you need dummy plugs as I understood that after 12.6 drivers windows does not need dummy plugs anymore. maybe only in this case(intel igpu integrated and amd radeon dedicated) you still need dummy plugs in windows. how about doing this setup in linux? is fglrx still coupled to the xorg video module? thx for trying to help pekv2! OP see here how to make a dummy plug: http://www.overclock.net/t/384733/the-30-second-dummy-plug |
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It should be possible to make this work. Maybe try asking the cgminer developer(user "ckolivas" on here)? I see a similar older thread where somebody got it working fine it seems: https://bitcointalk.org/index.php?topic=87611.0Some possible suggestions from the other thread: make sure bios is listed as using the integrated graphics not PCIe graphics as primary try putting a dummy plug on the radeon (sounds like what is needed here most likely?) follow directions there about installing amd drivers then intel(see first post) investigate lucid logix mvp virtu thing |
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So it seems to be working now?
Looks like performance is acceptable and shares are getting accepted?
Are you using the monitor on the integrated GPU or connected to the AMD gpu?
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OK. I suggest you also include this in your command when you launch cgminer:
"--gpu-platform 0"
so do "cgminer --gpu-platform 0 ...."
let me know what happens.I am really interested in making a similar setup. Mine exclusively without slowdown on AMD, browse/light game on Intel integrated.
Should be able to work fine theoretically
would be helpful if you can list your mobo model too
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what does "cgminer -n" show? we can then debug after knowing all the information.
i am interested in this setup and want to know if it can work.
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rPy6E6Q86a94EqvuiLDeVxyD6PoRLZRnxo
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hope you can spare some coin here:
4Mu81NWBe3o72hr8QxwJvqLN1yvhfJ9otr
thanks balthazar!
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