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Nvidia Driver Bug Running CUDA Tasks

post #1 of 31
Thread Starter 
Setup: 4 monitors on 2 GTX 460 cards in SLI. System specs in sig below. Nvidia Driver version 270.61.

Background: The GPU clocks change from 405MHz to top speed (default 675MHz on my ASUS GPU's) as required when a graphics apps like Heaven 2011 or a game is played. Multi-Monitor mode is NOT an SLI mode and only the primary graphics adaptor is used. It is NORMAL for the cards to idle down to 405MHz when not in heavy use and NORMAL for them to speed up when in heavy use.

Problem: When running a CUDA task, either exiting altogether or just snoozing the GPU screws something up! The cards idle down to 405MHz and NEVER EVER will switch back to high speed!!!!

REBOOT fixes speed switch problem until ANY single or multiple CUDA task is run, then repeat screwups.

Resetting to max performance mode single monitor (SLI Enabled) cures the problem.

Running CUDA tasks in SLI mode works properly!!! The clocks switch properly even with snoozing GPU or exiting. I cannot find a mode that prevents proper speed switching in SLI mode.

But, again, in muli-monitor non-SLI mode, the problem is very repeatable and doesn't matter if you use GPU-Z or MSI After Burner or whatever to monitor the clock speed. In fact, Heaven goes from 30FPS to 9FPS!!!

I will try to inform NVidia about this...

Just thought ya'll would like to know.



UPDATED Bug reported:

Reported to Nvidia forum and their tech support.

http://forums.nvidia.com/index.php?showtopic=200414
Edited by Tex1954 - 5/15/11 at 2:48pm
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Blue Beast
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post #2 of 31
This is also a problem with folding@home for example. Sometimes my card (gtx460) clocks down to 405Mhz when exiting F@h. This did occurred after installing the 270.xx drivers.
post #3 of 31
Thread Starter 
That is normal... they can downclock even further than that too!

I wrote it up in the Nvidia forums too. If you run a game in SLI mode or with only one card, seems everything works fine, the clock switches back to full speed etc. If you are saying there is a further problem, go ahead and add to this thread about it.

http://forums.nvidia.com/index.php?showtopic=200414

I have only noticed the speed switch problem lately... because I always used to switch to SLI mode before playing a game... then I noticed a problem, can't say when it started...


Edited by Tex1954 - 5/17/11 at 2:01am
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post #4 of 31
I meant that the card get's stuck on 405Mhz, it won't go in 3d mode again until a reboot.
post #5 of 31
sounds like a driver issue.my old ati card used to get stuck at 100% even when there was nothing running. Only a reboot fixed that issue, till a driver release fixed the problem.
    
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post #6 of 31
I've had this same crap for ages (since 260 drivers to be exact) and I'm on a single card. Even tested in my friend's quad core Windows 7 rig, card still down clocks whenever the hell it wants, even with Performance mode set in drivers...Tried in XP, same thing. And you're running multiple monitors, at which they're apparently supposed to stay at full clocks anyway, gg Nvidia...

-.-
Edited by Am* - 5/17/11 at 7:13am
    
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post #7 of 31
i had a gtx480 up till december and I never had a single issue with this so i'm not sure what to tell you man.
    
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post #8 of 31
Quote:
Originally Posted by DarkRyder View Post
i had a gtx480 up till december and I never had a single issue with this so i'm not sure what to tell you man.
I don't think 480s even have a low power 3D mode, hence probably why you aren't having similar problems.
    
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post #9 of 31
well i don't have it anymore, so i cant say whether a new driver caused the problem or not.
    
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post #10 of 31
Thread Starter 
New beta drivers just released... maybe they will help... I'll try it later or tomorrow maybe. Nothing from Nvidia yet about the tech support I asked for nor anything in the forums...

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