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Drop in CPU PPD after I started folding on second GPU

post #1 of 13
Thread Starter 
I got a more powerful PSU recently so I chucked in my 9800GTX to bump my PPD and while im getting around 5.5K from it my PPD only went up around 1k due to a 4k drop from my CPU.
My CPU goes back to around 9-10k when I have only 1 GPU folding.

Anyway to avoid this?

Cheers.
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Cerberus
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post #2 of 13
Interesting. I'm assuming your 9800GTX is folding on the GPU2 client, while the GTS450 is folding on the GPU3 client. If that's the case, the GPU3 client uses the CPU a bit.

This is why Fermi guys have to dedicate a core to GPU3.
post #3 of 13
Thread Starter 
Actually there both running on GPU3, would switching the GTX to GPU2 take some strain of the CPU?
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Cerberus
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post #4 of 13
Ah. There you go, that's why. You have to dedicated a core to GPU3.
But I believe it would, but your GTS450 would still be using up some of one core.
post #5 of 13
Quote:
Originally Posted by mbudden View Post
Ah. There you go, that's why. You have to dedicated a core to GPU3.
But I believe it would, but your GTS450 would still be using up some of one core.
You can set affinity for the same CPU core for running both GPU clients can't you? Or does each card need it's own CPU core?

-TG
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Gom Jabbar
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post #6 of 13
Quote:
Originally Posted by Tleilaxu Ghola View Post
You can set affinity for the same CPU core for running both GPU clients can't you? Or does each card need it's own CPU core?

-TG
Just one core for X amount of cards, but that's for GPU3 clients, does not apply for GPU2.
post #7 of 13
try -smp 3
post #8 of 13
With my 450's I just leave the affinities alone and let them all fight it out

One 450 uses about 5-6% of my i3-540 @ 4.2Ghz. It shouldn't make a huge dent in your i5
post #9 of 13
Thread Starter 
Well I changed the GTX over to GPU2 and set the affinity for GPU3 but still no change

Quote:
Originally Posted by omega17 View Post
One 450 uses about 5-6% of my i3-540 @ 4.2Ghz. It shouldn't make a huge dent in your i5
Yeah, mine uses about 2-3% but that seems to be causing a 4k dent
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post #10 of 13
I've said it before, yet people still don't know the difference.

Using GPU3 on a non-Fermi at the moment will result in the same WUs as the GPU2 client. And since it's the WU which increases CPU usage, it won't change anything going from GPU3 to GPU2.

Now, if it's a bad WU (more stressful than normal), that might be playing a factor, and it might also be the whole using 2 clients and one of them being a Fermi.

I'd try dedicating a core to the Fermi, and then leaving the last 3 cores for the 9800 and the SMP client.
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Megadoomer
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