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Getting GPUGRID to work on 4 GPU's

T

The Borg

Senior member
Hi all,

Please give me some idea of how to get GPUGRID to work on all 4 GPU's. I have 2 GTX 295 cards in my machine and the only way I can get more than 1 WU running is to switch off SLI. Then I get 2 running. I was expecting 4 to run and I did have 2 running with only one card installed.

Will the WU's complete quicked if SLI is one? It doens not seem so.
 
Yes, you have to disable SLI and extent the desktop. You also seemto have to have a monitor plugged in or at least a dummy plug.

the most I could get with the above is 3 running. Then I found the following registry hack. Works very well. What I have found so far is that I cannot overclock to the value I did before. Have not expermented much - been away a bit - but every few minuted, the screen would flicker and the WU would error out.

Okay the 4th GPU has entered the building.

After I taught myself CUDA I wrote my own program to enumerate the CUDA drivers present and was seeing 3 even though the nVidia control panel and the MMC device panel was showing 4. So it's not BOINC Manager.

I deinstalled all the nVidia drivers, rebooted and checked in the registry at

Hkey_Local_Machine\Hardware\DeviceMap\Video

to see what I had. There were 3 devices Video0, Video1 and Video2 present which were all standard VGA drivers. I then installed Forceware 185.68 and rebooted.

I now had 10 devices in the registry. I navigated down to

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Video

and looked to see what was present. Here we see a list of registry keys like

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Video\(GPU ID)\0000

where there is a key for each GPU. I searched the list and for each GPU e.g.

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Video\{D82C4D9A-396A-4292-A538-A8F8F22FFEB5}\0000\Settings field (where {D82C4D9A-396A-4292-A538-A8F8F22FFEB5} is a GPU id)

and looked for the words NVIDIA GeForce GTX 295.

I presumed (luckily correctly) that the 1st GPUID with those words in the Settings field had the monitor on it. To the following 3 GPU's I added the following registry keys:-

DisplayLessPolicy DWORD 1
LimitVideoPresentSources DWORD 1

at the

HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Video\(GPU ID)\0000

level in the registry tree and rebooted.

Now I only have 2 monitors showing in the nVidia control panel as having my desktop on them but my own CUDA program shows 4 GPUS. I fired up BOINC Manager which still displays that it found only 3 (due to the string length being exceeded I expect) but I have 4 running GPUS. 17) Message boards : Nvidia graphics cards (GPU) : Dual 295's only showing 3 of 4 cards (Message 8479)
Posted 10 days ago by JockMacMad TSBT

The abover works like a charm and not much work involved.
 
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