7/8 GPUs per Motherboard

[kslavik]

Is it possible to run 8 GPUs (not cards but GPUs) on the same motherboard using Windows 7 Home 32bit?

I'm running 4 cards already: 3x5970 and 1x5830, so it is 7 GPUs total on the same motherboard and I'm wondering if anybody was able to run 4 cards with dual GPU or 3 dual GPU cards and 2 single GPU cards on the same machine.

Assume that power requirement is not an issue. (I'm running 2 PSUs 1200W+650W)

I'm already hitting a limit with my 7 GPUs as only certain combinations of PCIx slots would get the cards recognized and configured.

[ssateneth]

i run 8 gpu on many of my rigs, but they are all 5k series. 7k are known to have driver and OS related limit of 4-6 gpu depending on driver revision and OS (rumor has it that 4 7990 dual gpu will work, so thats 8 gpu, but no proof out yet).

if you have missing gpus in your device manager, you either screwed up your riser, or forgot to short pci-e presence pins, or some sort of hardware limit with something to do with so many devices per set of pci-e slots (try different slots)

mobo msi z77a-g45

[squall1066]

rumor has it that 4 7990 dual gpu will work, so thats 8 gpu, but no proof out yet

I have herd the same thing, I don't think anyone is taking the risk of buying four of these cards just to see if it works.

I also heard that it's mainly win OS that has the multi GPU driver problem, Linux is easier to find and work with the hardware, But it is still entirely MOBO dependent.

[superresistant]

I have a rig 4 x 7990 (8 cores total), working with win 7 64 bit.

HashRate ?

[bitmateco]

I have a rig 4 x 7990 (8 cores total), working with win 7 64 bit.

damnnn thats like 5ghs!!!

[JohnSy]

Wow think of the power u need to run this'nn

[fractalbc]

Is it possible to run 8 GPUs (not cards but GPUs) on the same motherboard using Windows 7 Home 32bit

Many of you missed the key point.

Windows 7 home 32 bit.

32 bit windows is limited to 4GB addressable memory.  8 x 1GB GPU's want 8 GB addressable ram.

Folding enthusiasts discovered long ago that 4 or more cards generally require a 64 bit os.   ymmv of course.

[chungenhung]

Is it possible to run 8 GPUs (not cards but GPUs) on the same motherboard using Windows 7 Home 32bit

Many of you missed the key point.

Windows 7 home 32 bit.

32 bit windows is limited to 4GB addressable memory.  8 x 1GB GPU's want 8 GB addressable ram.

Folding enthusiasts discovered long ago that 4 or more cards generally require a 64 bit os.   ymmv of course.

exactly

[kslavik]

Is it possible to run 8 GPUs (not cards but GPUs) on the same motherboard using Windows 7 Home 32bit

Many of you missed the key point.

Windows 7 home 32 bit.

32 bit windows is limited to 4GB addressable memory.  8 x 1GB GPU's want 8 GB addressable ram.

Folding enthusiasts discovered long ago that 4 or more cards generally require a 64 bit os.   ymmv of course.

exactly

Thank you for that. I guess I'm lucky to be able to run 4 cards with 7 GPUs under 32 bits OS. I think I will just upgrade to 64 bit to have another card added. I spend enough hours by trying making it work with 8 GPUs.

[systic]

Wouldn't it be cheaper to just buy 7950s or 7970's. 900$ for 1200 hash is kind of extreme and not worth it.

[FullLife]

Wouldn't it be cheaper to just buy 7950s or 7970's. 900$ for 1200 hash is kind of extreme and not worth it.

It's definitely cheaper, 7990s are a waste of money.

[chungenhung]

If someone interested - 8x gpu hashing 4600 Kh/s in scrypt mining. Working with only 1 psu Lepa 1600w (drawing 1700w at wall). cgminer 3.2. drivers 13.1. core 835 @ mem 1375. 4 cores voltage lowered to 0.925 and 4 cores voltage defaul (not accesible at bios). Mobo gigabyte ga 990FXA, cpu sempron , 8 gb ramm. win 7 64 -bit.

What GPU?

[Madazam]

Is it possible to run 8 GPUs (not cards but GPUs) on the same motherboard using Windows 7 Home 32bit?

I'm running 4 cards already: 3x5970 and 1x5830, so it is 7 GPUs total on the same motherboard and I'm wondering if anybody was able to run 4 cards with dual GPU or 3 dual GPU cards and 2 single GPU cards on the same machine.

Assume that power requirement is not an issue. (I'm running 2 PSUs 1200W+650W)

I'm already hitting a limit with my 7 GPUs as only certain combinations of PCIx slots would get the cards recognized and configured.

what is your driver and sdk version?

[kslavik]

Is it possible to run 8 GPUs (not cards but GPUs) on the same motherboard using Windows 7 Home 32bit?

I'm running 4 cards already: 3x5970 and 1x5830, so it is 7 GPUs total on the same motherboard and I'm wondering if anybody was able to run 4 cards with dual GPU or 3 dual GPU cards and 2 single GPU cards on the same machine.

Assume that power requirement is not an issue. (I'm running 2 PSUs 1200W+650W)

I'm already hitting a limit with my 7 GPUs as only certain combinations of PCIx slots would get the cards recognized and configured.

what is your driver and sdk version?

SDK 2.5
Driver 12.8

I found them producing the best results for 5xxx cards

[Madazam]

Is it possible to run 8 GPUs (not cards but GPUs) on the same motherboard using Windows 7 Home 32bit?

I'm running 4 cards already: 3x5970 and 1x5830, so it is 7 GPUs total on the same motherboard and I'm wondering if anybody was able to run 4 cards with dual GPU or 3 dual GPU cards and 2 single GPU cards on the same machine.

Assume that power requirement is not an issue. (I'm running 2 PSUs 1200W+650W)

I'm already hitting a limit with my 7 GPUs as only certain combinations of PCIx slots would get the cards recognized and configured.

what is your driver and sdk version?

SDK 2.5
Driver 12.8

I found them producing the best results for 5xxx cards

Thx man ...i have win7 32 bit and i want to install 3 5970...it only recognizes 5 cores and one core is missing...so just to make sure with the above SDK and driver i will be able to run three 5970..? also how is 12.8 driver for 6xxx and 7xxxx if i want to add any more cards ....my mobo is z77a 45 MSI and Lepa 1600 w power supply so i think they should be able to handle it ....

thx in advance mate ....

[kslavik]

I hit the limit of 7 GPUs even before drivers are installed. If I don't use just right slots or stick 8 GPUs, some cards are not even recognized by the system and not all GPUs would show up inside Device Manager with yellow icons.

So, if you can see 6 GPUs (3x5970) inside Device Manager with yellow icons, most likely you will be able install a driver to set them up correctly (might take some time).

I also found that PSU 1250 is enough for 3 5970, but not enough for 3x5970 + 1x5830.

I have never tried to mix 5xxx and other series cards on the same board. But I would guess that if you you can see all your GPUs inside device manager with yellow icons (no driver), you are half way there, and will be able to install the driver as well.

5970 should produce about 394Khs x 2  with 840 core and 1180 memory for scrypt or 392Mhs x 2 with 825 core 300 memory for SHA256
They are stable at 1074-1099 V

I could push them further a little bit, but heat becomes an issue.

I hope that helps

[boost75]

I've had 5 cards running on this board. They say you can run 6 I believe. I also have a board I used for 2 weeks with 2 PCI risers for sale.

 
http://www.amazon.com/gp/product/B007QWI9TY/ref=as_li_ss_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B007QWI9TY&linkCode=as2&tag=smamedgro-20

[kslavik]

I've had 5 cards running on this board. They say you can run 6 I believe. I also have a board I used for 2 weeks with 2 PCI risers for sale.

http://www.amazon.com/gp/product/B007QWI9TY/ref=as_li_ss_tl?ie=UTF8&camp=1789&creative=390957&creativeASIN=B007QWI9TY&linkCode=as2&tag=smamedgro-20

The problem is also an operating system: I have Win 7 32 bit which limits memory to 4GB, so system just unable to allocate enough resources to map all the GPUs installed. I have 4 cards on a similar motherboard ( MSI Z77A-GD65), but 3 of those cards are 5970 with dual GPU.

[Madazam]

I hit the limit of 7 GPUs even before drivers are installed. If I don't use just right slots or stick 8 GPUs, some cards are not even recognized by the system and not all GPUs would show up inside Device Manager with yellow icons.

So, if you can see 6 GPUs (3x5970) inside Device Manager with yellow icons, most likely you will be able install a driver to set them up correctly (might take some time).

I also found that PSU 1250 is enough for 3 5970, but not enough for 3x5970 + 1x5830.

I have never tried to mix 5xxx and other series cards on the same board. But I would guess that if you you can see all your GPUs inside device manager with yellow icons (no driver), you are half way there, and will be able to install the driver as well.

5970 should produce about 394Khs x 2  with 840 core and 1180 memory for scrypt or 392Mhs x 2 with 825 core 300 memory for SHA256
They are stable at 1074-1099 V

I could push them further a little bit, but heat becomes an issue.

I hope that helps

Thx man, this really helps in configuration and increasing my hashrate. My prob is that, one GPU core simply isn't there in device manager no yellow nothing. I am using win7 32 bit, 11.12 driver and and i think 2.5 sdk.

I know i can work it out with 64 bit and win8 does support more gpu than 5 but dont wanna change the whole system for this......if this can be solved with some other way......

[kslavik]

Thx man, this really helps in configuration and increasing my hashrate. My prob is that, one GPU core simply isn't there in device manager no yellow nothing. I am using win7 32 bit, 11.12 driver and and i think 2.5 sdk.

I know i can work it out with 64 bit and win8 does support more gpu than 5 but dont wanna change the whole system for this......if this can be solved with some other way......

Do you get another yellow icon in device manager for PCI-e controller (with error message that there is no enough system resources)? if so try to rearrange cards to different PCI slots - it did help me. In my experience: if GPU doesn't show up in device manager with yellow icon - no driver will help.