2nd GPU stuck at idle clock speeds??


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Profile Codeman05
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Message 1020099 - Posted: 27 Jul 2010, 14:09:51 UTC

Hi guys,

I recently popped a second GPU (GTX260) in one of my crunchers and have noticed that this second GPU...while crunching...will remain at stock clock speeds and thus is rather slow.

For example, the 1st GTX260 is running at 650mhz core, the 2nd is running at only 400Mhz and is almost twice as slow.

I've tried with SLI enabled, SLI disabled, overclocking etc... and can't seem to get the #2 card to throttle up.

I'm running BOINC 6.10.18 with the latest Lunatics Unified Installer and the Nvidia 258.96 drivers (W7 64).

Any suggestions?

Thanks in advance.

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Message 1020102 - Posted: 27 Jul 2010, 14:15:38 UTC - in response to Message 1020099.

do you have a dummy plug installed? cc_config?
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Profile Codeman05
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Message 1020104 - Posted: 27 Jul 2010, 14:18:33 UTC
Last modified: 27 Jul 2010, 14:19:45 UTC

I don't have a dummy plug on the second GPU, I thought that only helped when the second GPU wasn't being seen by BOINC?? I have some extras though so I can give that a shot. No custom cc_config.

I just rebooted and now both cards are running at full speed again.
Seems like the 2nd card randomly will downclock to idle speeds (still under full load and crunching). I'll keep an eye on it now that I'm aware of the issue and see when it drops off.

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Message 1020105 - Posted: 27 Jul 2010, 14:19:02 UTC - in response to Message 1020099.

We need to know
1) What motherboard ?
2) What Nvidia driver version ?
3) What O/C'ing tool are you using ? e.g. Riva Tuner, EVGA Precision etc.
4) Any other details you feel might be relevant :-)

T.A.

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Message 1020106 - Posted: 27 Jul 2010, 14:22:22 UTC - in response to Message 1020105.
Last modified: 27 Jul 2010, 14:25:27 UTC

1) Gigabyte X58 GA-X58-UD5
2) Forceware 258.96
3) EVGA Precision
4) W7 64 | Boinc 6.10.18 | both cards are EVGA GTX260 216s | using gpuz to watch load

Upon further research into this it looks like the second gpu will *usually* start out fine and then at some point overnight (or a few hours) drop to idle clock speeds, but still be processing WUs (judging by the memory/gpu load).

I noticed the #2 card was set to be the PhysX card in the NV control panel, I just disabled that for the heck of it to see if that has any affect.

Thanks for the input

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Message 1020123 - Posted: 27 Jul 2010, 14:56:53 UTC - in response to Message 1020106.

I can't help that much as I haven't had that much to do with Win7. However previous experience with EVGA Precision indicates it does strange things sometimes when 2 cards are fitted. For some reason the settings don't "stick" and cards drop back into 2D mode when they've finished a unit and don't go back to 3D when the next unit starts. Watch the fan speed settings too, they tend to lock up at around 30% and the cards overheat.

I have the latest version (V1.9.5) on my GTX470 box, it looks like it may have better support for multiple GPU's than earlier versions but I haven't tried in that mode. If you're not already using it, it may be worth a try

Hope that's some help

T.A.

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Message 1020124 - Posted: 27 Jul 2010, 15:02:14 UTC - in response to Message 1020123.

Thanks T.A, that's good info.

I am running an older version of Precision and the problem your describing sounds exactly like what I'm seeing. I'll give the new version a shot as well.

Thanks again

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Message 1020125 - Posted: 27 Jul 2010, 15:02:46 UTC - in response to Message 1020106.

1) Gigabyte X58 GA-X58-UD5
2) Forceware 258.96
3) EVGA Precision
4) W7 64 | Boinc 6.10.18 | both cards are EVGA GTX260 216s | using gpuz to watch load

Upon further research into this it looks like the second gpu will *usually* start out fine and then at some point overnight (or a few hours) drop to idle clock speeds, but still be processing WUs (judging by the memory/gpu load).

I noticed the #2 card was set to be the PhysX card in the NV control panel, I just disabled that for the heck of it to see if that has any affect.

Thanks for the input

Are you getting a driver crash sometime in the night? Mine did that until I put a rubber spacer between my cards to let more air in.
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Message 1020126 - Posted: 27 Jul 2010, 15:03:32 UTC - in response to Message 1020102.

do you have a dummy plug installed? cc_config?

I took all my Dummy plugs off and all works fine.
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Message 1020173 - Posted: 27 Jul 2010, 21:31:58 UTC - in response to Message 1020125.

Are you getting a driver crash sometime in the night? Mine did that until I put a rubber spacer between my cards to let more air in.


Actually...yes I am. I stopped by the house at lunch and started looking through the Event Viewer in Admin Tools.

When this happens I am getting the following error:
"Display driver nvlddmkm stopped responding and has successfully recovered."

The WU's being processed then crash, showing as errored out.
The GPU's then start on the next WU's, but with the low clock speeds and slowness.
Closing Boinc and restarting it doesn't work, I have to reboot the box. Then it's fine until the driver crashes again.

Temps look good though, I'm under 70C.
Think I'll try and older NV driver first and see if that helps any.

Thanks again for the input guys :)

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Message 1020178 - Posted: 27 Jul 2010, 21:49:04 UTC - in response to Message 1020173.

I used the little rubber protector ends from my Sata cables as spacers for my video cards and helped a lot.
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Message 1020195 - Posted: 27 Jul 2010, 22:54:22 UTC - in response to Message 1020178.

I found on my BFG GTX 260 any overclock on the memory over 1200 would
give an "Display driver stopped responding and has successfully recovered".
Whats your memory set at.

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Message 1020202 - Posted: 27 Jul 2010, 23:30:56 UTC - in response to Message 1020195.

I found on my BFG GTX 260 any overclock on the memory over 1200 would
give an "Display driver stopped responding and has successfully recovered".
Whats your memory set at.


I've just been running stock so far at 590/1000/1296 (core/mem/shader).
So far the older driver's seem to be helping, we''ll see how it does overnigiht though.

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Message 1020258 - Posted: 28 Jul 2010, 4:44:03 UTC

I have the same problem, except that my GTX260 is the only GPU in the system. Just realised it's 5.40 am and I'm now late for work, so I'll check in on this later. I did change a setting in EVGA precision (1.9.4) that seemed to help, but I can't remember what it is.

Giz.

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Message 1020360 - Posted: 28 Jul 2010, 12:38:17 UTC

Just for reference, I ended up going with an older NV driver that I'm using on another rig, Forceware 197.45.

That seems to have done it. Before I was getting driver crashes every 2-3 hours, so far I'm 14 hours with zero errors. So far so good.

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Message 1020627 - Posted: 29 Jul 2010, 17:00:41 UTC
Last modified: 29 Jul 2010, 17:01:33 UTC

Since nobody else has mentioned it, here's what I did when I realized that I had the same problem: HowTo - Prevent GTX 200 Series Downclocking using RivaTuner.
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