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Author Topic: Motherboards: What Works w/Four or More GPUs? List Them  (Read 52984 times)
induktor
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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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