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CPU for GPU-only folding?

post #1 of 10
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After the CC, I've gotten addicted to folding 24/7. However, I only have one rig (1405T + 5850), and not only does it get me only 8-10K PPD on average, but it's my primary gaming rig as well.

I'm looking to build a rig for 24/7 folding, and increasing my PPD. I have enough parts to throw together a cheapo rig (Athlon II dual core based), and buying a single GTX 460 768MB for GPU-only folding (that's all I can afford right now). In the future, I plan to add another GTX 460 768, but I'm wondering how much CPU power I'd need for folding on these GTX 460s. Would it even be worth it?

Any help would be appreciated. Thanks!
 
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post #2 of 10
An athlon dual core should be good for 4 gtx 460's based on the usage I got using a GTX 460 with my athlon dual.
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post #3 of 10
I use an old Athlon 64 2.2Ghz single core for my 9800GX2.... Most CPU usage I have seen is 10% per instance (I have two GPU2s running). I hear the GPU3 client is a little more CPU intensive, but I doubt much more.
 
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post #4 of 10
I've been a long time folder and if I went back to running dual 24/7 rigs the secondary would be a barebones i7 running bidadv only. Since bigadv hit the block and went mainstream (read: no longer needing VM to run), GPU folding has become really inefficient. A single clocked i7 will be much more efficient power/PPD wise than a dual 460 rig.
 
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post #5 of 10
Last year I was running 3 OC'd GTX465s on an E4300 1.8GHz Dual Core. I had to OC the CPU to 3GHz+ because my PPD was lower than it should have been. I think it was more an issue of the slow CPU than the CPU actually loading 100%. Things are better now though with GPU3 CPU usage.

For 2 GPUs your Athlon should be fine, but if its a lower clocked model you may have to OC a little.
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post #6 of 10
Thread Starter 
Quote:
Originally Posted by theonedub View Post
I've been a long time folder and if I went back to running dual 24/7 rigs the secondary would be a barebones i7 running bidadv only. Since bigadv hit the block and went mainstream (read: no longer needing VM to run), GPU folding has become really inefficient. A single clocked i7 will be much more efficient power/PPD wise than a dual 460 rig.
Yeah, I hear that one man! I've read that those bigadv WUs give a lot of points. But the reason why I'm asking is because I've already got all the parts lying around to build a computer. The only thing I'd buy is the GTX 460 768MB GPU, which I believe I can get for ~$125. Building an i7 rig would cost much more.

Quote:
Originally Posted by franz View Post
Last year I was running 3 OC'd GTX465s on an E4300 1.8GHz Dual Core. I had to OC the CPU to 3GHz+ because my PPD was lower than it should have been. I think it was more an issue of the slow CPU than the CPU actually loading 100%. Things are better now though with GPU3 CPU usage.

For 2 GPUs your Athlon should be fine, but if its a lower clocked model you may have to OC a little.
I have an Athlon II X2 260; stock is 3.2GHz. Will that suffice? I don't want to get a GTX 460 and then find out the CPU is holding it back from it's full potential.
Edited by onoz - 5/23/11 at 4:16pm
 
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post #7 of 10
For gpu folding like mentioned above a low speed dual core will work just fine.If it is a pretty slow one you might suffer a little ppd.Just try not to cpu fold and gpu fold with it.
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post #8 of 10
My 470s get my pentium D at 3GHz to 80% load if that helps you pick one. This one gets the same out of them that my i3 did but I need at least what I have.

Edit: Yes your athlon will be more than enough
Didn't read properly the first time
Edited by Mike-IRL - 5/23/11 at 4:21pm
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post #9 of 10
Quote:
Originally Posted by onoz View Post
...
I have an Athlon II X2 260; stock is 3.2GHz. Will that suffice? I don't want to get a GTX 460 and then find out the CPU is holding it back from it's full potential.
Yeah that will be fine. For just 2 GPUs you really dont have to worry.
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post #10 of 10
Thread Starter 
K, got all of my questions answered. Thanks everyone!
 
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