There were known issues with XP Home and multi-core CPU's some time back when multi-cores were still relatively new on the mass market scene. XP Pro didn't have any real issues that I can remember encountering.
XP was built on server core code instead of legacy workstation OS code, which already had multi-core/multi-CPU code built into it. That's why so many games had problems and DirectX was a nightmare around when XP came out. The server code simply never needed to do what was being asked of the workstation OS. They fixed all of that (obviously) but XP Home is a newtered vesion of XP Pro so I think that's where the problems with multi-=core CPU's stemmed from.
I'm running XP Pro 32-bit and 64-bit on a dual boot with 4Gig on a dual-core AMD 6400+ black edition, and even though the current machines wipe the floor with it, it rocks for my purposes. Besides, I got the CPU for a song because Intel are beating AMD hands-down at the moment!
UA
