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Does L3 Cache Help Folding Performance?

post #1 of 7
Thread Starter 
I'm in the market for some newer generation AMD chips to replace my aging x2s in my folding farm, Is the price premium for a Phenom II over an Athlon II worthwhile in folding? I know the only difference is L3 cache.

Thanks for any input.
   
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Silent but Deadly
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post #2 of 7
If your priority is AMD CPUs, then you have a valid question. If your priority is Folding@Home performance, the question is mainly irrelevant.
Please do not read my reply as disrespectful, I just don't see your proposed upgrade as improving FAH performance enough to be worth any expenditure at all.
    
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post #3 of 7

Keep the Phenom II. It performs better in everything including folding. L3 cache is known as shared cache. When the processor is chugging away at hard tasks, that L3 cache is put into use and then some, but FAH performance also depends on the CPU architecture and many, many. many other factors.

 
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Gsvlip Dudyrm
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post #4 of 7
Thread Starter 
Got it, I wasn't referring to my sig rig, just other strictly Folding machines.
   
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post #5 of 7

Modern processors that have L3 integrated into their design benefit from it and are designed to use it. Processors like the Core 2 Quad are designed to use L1 and L2 cache, but at the same time, deliver the same performance as a Phenom II. 

 

When it comes to folding, Cache is only a  small part of a larger picture.

 
Gsvlip Dudyrm
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Gsvlip Dudyrm
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post #6 of 7
I am trying to remember, but if memory serves in my drunken state, an PII will overclock higher while folding.

At same clocks and same number of cores the PPD should be the same or within a few 100 PPD. I remember my X3 440 getting around 5~6K PPD and my X6 1035T was getting about 10~11PPD, both were clocked the same speed, so twice as many cores and twice the PPD, but that was awhile back before the wife found my hobby, I cannot verfiy the number now.

-Ren
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post #7 of 7
I bet lots of L3 matters more on big n-way setups (that are hopefully folding -MegaAdv) than it does on single proc machines. Keep that slow ECC DDR3 dual channel system ram from being a bottleneck (it sounds silly, but when you've got a 16-way system it's not, I promise).
 
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