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Random SLI problems

post #1 of 17
Thread Starter 
I'm using 2x gtx 460s in SLI. They've been fine since I've gotten them until recently. There are two problems.

1) When I wake the computer from sleep (or just after a while of inactivity), the monitor will usually stay black for a while before showing the desktop, or it will flash between a black screen and the desktop. Also, occasionally, the top half of my monitor will also show text as slightly blurry, whether it's in a game or firefox. So far I've been able to fix it by simple turning my monitor off then on.

2) This problem only started about two weeks ago, and has only happened three times, but will probably occur again. While playing a game (either while actually playing, or when I start a game and notice) my fps will be almost half, and the usage of one of the cards will be 99% and the other will stay around 5-10%; in skyrim both cards normally hover around 33% each, except when this problem occurs. The first time this happened I just restarted and that fixed it. The last time it happened I tried connecting another monitor to see if I could find the problem but before I could the problem when away.

I have the latest drivers, and have tried disabling any power saving features. I have also run furmark, and occt with error detection and received no errors and temperatures never went avove 60C.

So I'm not really sure what the problem is. Any help would be appreciated.
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post #2 of 17
I had weird GPU usage when I had my cards in the first and third slot, when I switched to the first and second slot both GPUs would be fully used. My cards didn't like being in an x16/x8 slot, going to x16/x16 fixed that issue.
As far as your other issue, try reseating your SLI bridge, that has fixed many weird probs for me as well.
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post #3 of 17
Thread Starter 
I have them running in 16x 4x, because the first gpu covers the 2nd 8x slot and the psu won't let me fit the 2nd card in the last slot 8x, so it has to be 4x. And like I said, these problems only started recently, they've been running fine for over a year. I switched the cards around (and re-seated the sli bridge in the process) and the problem still occurs.
Edited by Daggerfist - 9/16/12 at 3:45pm
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post #4 of 17
Well x16/x4 is definitely going to impact your performance
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post #5 of 17
Thread Starter 
Quote:
Originally Posted by JTHMfreak View Post

Well x16/x4 is definitely going to impact your performance
Quote:
Originally Posted by Daggerfist View Post

And like I said, these problems only started recently, they've been running fine for over a year.
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post #6 of 17
I'm assuming you have run through the nvidia control panel to see that nothing got set incorrectly the last time you updated drivers?

I know this sounds unrelated, but I had a really weird problem 3 years ago where my monitor would start flashing to black, then come back, go black, etc. But not all the time. Went through all kinds of diagnostics - psu, swapped gpu's, reloaded drivers, etc. Turned out to be the monitor itself - a little spider had made a nest in the top and the monitor was overheating. Vacuumed it out, and accumulated dust and the problem went away.

My point is - check the monitor for dust too.

Good luck!
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post #7 of 17
Thread Starter 
Everything looks okay in nvidia control panel. The back of the monitor does feel a little warm, but not excessively so. I blew the dust out anyway, just in case.
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post #8 of 17
Maybe consider blowing any dust out of the gpu's? Hope you solve it soon. I hate random issues! Just break already so I can figure it out! biggrin.gif
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post #9 of 17
You are using 306.23? Most SLI issues are caused by the bridge being loose. Are you using HDMI or DVI to your monitor? It would be good to also know what kind of monitor you are using. The description you gave in #1 sounds like the monitor has a fault, try running it at 1080p at 59Hz instead of 60Hz (assuming its a 1080p LCD you're running).
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post #10 of 17
Thread Starter 
Quote:
Originally Posted by SpartanVXL View Post

You are using 306.23? Most SLI issues are caused by the bridge being loose. Are you using HDMI or DVI to your monitor? It would be good to also know what kind of monitor you are using. The description you gave in #1 sounds like the monitor has a fault, try running it at 1080p at 59Hz instead of 60Hz (assuming its a 1080p LCD you're running).

Actually I have 301.42. Didn't notice a newer version was released. The SLI bridge is not loose. I am using HDMI to my monitor and DVI to the gpu. The monitor is a 1920x1200 HanngsG. Newegg has a monitor that's similar. The current refresh rate is 59Hz. I think even if I set it to 60Hz it resets to 59.

Edit: Found the monitor on HannsG's site.
Edited by Daggerfist - 9/16/12 at 5:08pm
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