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3dmark - Card "loses" connection in the middle of test?

post #1 of 4
Thread Starter 
What happens is that while I'm running my bench, the cards will randomly cut off connection with the monitor for ~15sec, after which my screen will revert back to normal and 3dmark will cancel the test telling me that it "lost connection with the device". This occurs randomly. I will sometimes be able to get a complete run with the exact same clock settings.

• I use 2 identical Gigabyte Gtx560 Ti(oc) in SLI.
• I use the latest & stable MSI Afterburner to overclock.
• For some reason only 1 of them is able to reach 100% (Bought locally) fan speed while the other has a limit of 75% (Imported from US) - Very odd.
• Temperatures peak at 83deg on my first card and 73deg on second.
• Second card does undedicated Physx.
• I use a mini-hdmi to hdmi cable to connect my card and monitor. Cable version 1.4a made by authentic manufacturer.

Questions
What's up with the fan speeds?
How do I fix this?
Is there a difference between the mini-hdmi & dvi port?
Edited by Dust - 5/28/11 at 3:48am
    
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post #2 of 4
Is this happening under overclock or also under stock speeds as well?

Two things you can try.

1. Change the bios of the second card to the be similar to the first (you can see bios versions of the cards under gpu-z).
2. You can try and run 3dmark per card, as in connect just one and run it and test it, see if both cards are fine and working.

It could be either bad sli bridge, bad overclock (1 card is fine the other isn't), none matching bios issues.

The fact that both cards are of the same make doesn't mean that they will overclock the same, so one card might be fine, but the other isn't with those same clocks and volt.
I have 4 cards of exactly the same make and series (sequential S/Ns). Two of them can go over the 1K, 1 can only do 980, and one can do 970 core speeds.
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post #3 of 4
Thread Starter 
Ahh! Gpu-z.. totally slipped my mind! Going to check the bios right now.
Anyway I've resolved the crashing issue by doing individual overclocks on the cards. One went to 1Ghz and the other only reached 960Mhz. Quite upset on the marginal difference but at least my crashing has been resolved - I'm now running my cards at separate clock speeds and benching is smooth.
    
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post #4 of 4
Quote:
Originally Posted by Dust View Post
Ahh! Gpu-z.. totally slipped my mind! Going to check the bios right now.
Anyway I've resolved the crashing issue by doing individual overclocks on the cards. One went to 1Ghz and the other only reached 960Mhz. Quite upset on the marginal difference but at least my crashing has been resolved - I'm now running my cards at separate clock speeds and benching is smooth.
In SLI, both cards run according to the lowest card.
If you have one at 1ghz and one at 960mhz, they will both run as if they have 960mhz.
So individual overclockins is a bit pointless really.
Keep them both at 960 and you are fine.
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