well, windows itself is an OS, but to run windows XP U don't need the full 2 GHz of A cpu like athlon64 3200+
the thing is the usage of windows eats a lot less CPU resources, so even if u r using a single core CPU, which for general desktop usage, & gaming is what i prefer over the premium of Dual core
when it comes to Workstation tasks, go for Dual core, that what i still say, for everything else, there is single core, buy dual core only after 2 years
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