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does PPD differ from project to project.

post #1 of 8
Thread Starter 
hi, sorry, i am pretty new to this.

i did 2 work units so far smp,with console i had like 5.2 ppd thing.

now doing one with gpu tracker but only getting 3.5k ppd

so total is 18k rather 20k

by the way does my numbers look right in the first place?
    
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post #2 of 8
Yeah different project numbers have different credit values, also some take longer to complete than others, and you are rewarded bonus points for finishing them faster.
post #3 of 8
Yes ppd does vary depending on the project. Is that 3.5k ppd for the 955? What is your overclock on it?
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post #4 of 8
Thread Starter 
i am a stock'er'

i have bad chip, does not got 3.7 even if i give it 1.55v, so left it stock.

thing is though, i got like 5.2k ppd earlier today (from cpu, using the console thing from their website)

this time using gpu tracker. is gpu tracker the problem?
    
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post #5 of 8
It's possible having the tracker running is taking a bit of time away from the SMP client.. I've never tried the tracker program myself, so it's just a guess. Do you know what project number you ran with the console version and which one your running now? There are a few projects that are significantly slower than the others. Maybe once it's done this one switch back over to the console and see if it makes any difference?
post #6 of 8
Thread Starter 
hmm, i just used console thing, now i getting 4.8k..

anything happens if you give wu in time?
    
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post #7 of 8
Basically there is a benchmark set by a pretty low end (If i remember right!) Stanford system for how long a particular WU should take to finish. Bonus points are awarded based on how quickly you can finish the WU relative to their benchmark. The more active you are on your computer while it folds (gaming and flash content for example) the longer it will take to crunch each step. To maximize your PPD, try to ensure that you only start a WU when you know you will either be leaving your comp alone or doing very light stuff (word processing/light browsing)

As long as you are getting A3 work units, there really isn't much to worry about. The 6701/6702 WU are notorious for putting a massive dent in the SMP PPD. I just picked one up myself, sigh!
post #8 of 8
PPD is consistent on the benchmark, but no one buys a computer "exactly" like their benchmark systems, so PPD will vary. You may have faster memory, but a slower hard drive, lower GHz, but larger cache size.

For example, some work units use a lot of processor cache, some may not use it as much. Because the cache size (in this example) is limited on the benchmark system (not actually) your processor will do much better (higher PPD) on the WUs that use a log of cache. And on other WUs that don't use much cache, the PPD will be more inline with the benchmark system.

Also consider that with the SMP bonus, a 1% speed increase in your system equates to a 10% or more increase in bonus points. The bonus points scale is exponential. A small increase really scales up, but the reverse is also true. A slight speed drop while surfing or playing vids can knock down the PPD as well.

All these things can play in to PPD variance on computer systems that fold.
Edited by 7im - 1/25/11 at 3:37pm
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