SuperPi on GPU, were going CUDA

[Lestat]

yeah I know.. I was just testing out why in some cases some cores in a prime run appeared to run slower, but they don't it's just overhead.

good question to have, the reason is some prime tools are not multi threaded, but your talking about PRIME, this thread is about PI 2 VERY different things.
and XP is not multi thread friendly where Vista is a must more multi thread friendly OS, a perfect example is video encoding. run the same program under those 2 os's and your guarenteed to have more mutli thread usage under vista than XP, if the program is coded correctly that is.

in terms of PI, PI is not a multi threaded application so unless you set the affinity it usually always hits 1 core with a higher thread priority than the other core. thats just the nature of the beast.

Fugger is designing the app to be a video card PI capp which again as you probably know is a very different type of coding and multi threading scenerio.

you've said prime several times are you meaning prime or are you meaning PI

lastly if you are referring to PI and just mistakenly said prime, and you are setting the affinity for each run of PI to a different core, and 1 core is slower, well, Fugger might be able to shed some light on things or someone else maybe but i have not seen the slow down per single core that you are referring to... :\