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CPU ppd dropping while doing trivial tasks-Solved

post #1 of 7
Thread Starter 
Greetings,

I've just started folding on SLI'ed 460's today and noticed some ppd drops. While I leave the computer alone, the ppd drop was about as I expected, 1K~1.5k, nothing dramatic. However, whenever I use the computer for something even trivial as Windows Photo Viewer or browsing forums with Chrome, CPU ppd takes another 3k~5k hit.

Is that normal? I do recall there was a drop around 2k back when I was folding on only one 460...
Edited by dantoyang - 8/2/11 at 9:08pm
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post #2 of 7
If I remember right, it is a side effect of SLI. Disable SLI when folding, and it should be okay.
     
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post #3 of 7
I fold on SLI 460's and the PPD on the CPU drops 2-3k and I also lose 1-1.5 on each 460 when I am surfing
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post #4 of 7
That is pretty typical when trying to fold on all CPU cores and 2 GPUs.

If your CPU us folding "-smp" or "-smp 8", change it to "-smp 7'.

It leaves a core open for the GPUs and light computer tasks.
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post #5 of 7
Thread Starter 
After some tweaking I found that de-SLI improved my TPF on project 4061 from 14ish minutes to 11:30. Thanks a lot for the help. The 10%~20% difference due to SLI seemed to be surprising large to me hence the panic . Guess my 2nd 460 will now be dedicated folder until Rage/BF3 release.
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post #6 of 7
You could just flip SLI on/off. I know it is a lot easier to do than with Crossfire.

As to why it happens... if you watch a usage graph of the cards in MSI Afterburner, or similar, you will notice with the SLI/Crossfire turned on, they periodically dip in usage, whereas when it is off they keep a solid percentage at all times.
     
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post #7 of 7
Thread Starter 
I did notice those drops, though it boggled me even more since it was SMP ppd that took a hit instead of GPU. As for flipping SLI, well...I am currently in gaming hiatus anyway so I might was well leave if off I suppose. Waiting eagerly for Rage...
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SimMC
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WD 1TB FAEX, Seagate 500 Gb Lite-on 24x Windows 7 Home/Ubuntu 10.x Samsung 2443BWX 24'' +Some 10year old Samsung 14'' 
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