Your OS won't limit your cores as far as I know. The programs you force you to run a certain number of cores. CPU intensive programs might use up to four, others will only need one or two, depending on the stress put on the CPU.
cool, thanks, I have 4, I would run vista to free up that last GB, but it would bog down my graphics and processor. does 64bit XP let you run all the software still?
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