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Folding with different GPUs

post #1 of 16
Thread Starter 
Can some explain why there is a ppd drop when using different GPUs. Actual evidence would be really nice, not just speculation. I have an open PCIe on my 780i but it can only be a single slot card, due to the PCI sound card.

Thanks
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post #2 of 16
1. Find another GTS
2. ???
3. Folding profit!

I'm sure it has something to do with different cores reacting differently to the same display driver and the rest of the system having to accommodate it which slows it down a little. No proof whatsoever on that, just makes sense.

***On another note - would it be possible to fit a GTS with a stock single slot HSF of a similar card? GT, etc?
Edited by rpm666 - 12/24/08 at 5:32pm
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post #3 of 16
Thread Starter 
Quote:
Originally Posted by rpm666 View Post
1. Find another GTS
2. ???
3. Folding profit!

I'm sure it has something to do with different cores reacting differently to the same display driver and the rest of the system having to accommodate it which slows it down a little. No proof whatsoever on that, just makes sense.
I would get another GTS but I need single slot since they layout is:
PCIe 16x -8800GTS
PCIe 1x -(covered by 8800GTS)
PCIe 16x
PCI -Sound card
PCIe 16x-8800GTS
PCI -(covered by 8800GTS)

Someone said that it was due to different shader clocks. Is this true? If so, I can just pick up a 8800GT/9800GT and vmod and OC.


Quote:
Originally Posted by rpm666 View Post
***On another note - would it be possible to fit a GTS with a stock single slot HSF of a similar card? GT, etc?
Thats not a bad idea. If they would fit then I could do that. I bet I could find a dead GT.
Edited by mortimersnerd - 12/24/08 at 5:35pm
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post #4 of 16
nVidia isn't that creative I'm sure there's a matching single slot cooler that could fit it and handle temps OK - especially if it's the bottom card.

In regards to the shader clocks I'd call it a toss up. just say a GTS at 2000 and a GT at 1800 and the GT gets less PPD so it must be because of different core? Doesn't make sense to me.

Back to wrapping.
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post #5 of 16
Wait
If I ran a GSO with a GTX my ppd would take a hit?
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post #6 of 16
Quote:
Originally Posted by grunion View Post
Wait
If I ran a GSO with a GTX my ppd would take a hit?
No clue.
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post #7 of 16
Attachment 91600

Thats a 9800gtx and 9800gt.The 9800gt has 128 sp's and my other 2 in another machine get about 6000ppd on same wu.
It gives a huge ppd drop but, im putting the 3 9800gt ultimates together , I have a new board sittin here waiting.

Edited by markt - 12/25/08 at 3:42am
    
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post #8 of 16
i'm folding with a 9800GTX+ and a 8800GTS 320.

I get about 6k with the 9800GTX+ [with or without the 8800 folding in the other slot]

but for the 8800 GTS. I use to get like 4.5 k on it when it was by its self. It now will get 2k at best.

not sure why just telling you how it runs for me.
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post #9 of 16
Thread Starter 
So what is that cause of the ppd drop? Is it the different amount of shaders and the clock speeds?
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post #10 of 16
some people seem to think its just the difference in shader speed.
http://foldingforum.org/viewtopic.php?f=52&t=7463

but that doesn't make sense to me. i heard someone mention before the it has to do with one core being g80 and the other g92
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