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Just remember that 32 bit versions of XP and Vista will not see any ram past around 3.4 GB. If you want to use 4 GB and actually use it all, you have to go 64 bit.

If you're gonna spend $300 just on the cpu, you've gotta have this guy:

http://www.newegg.com/Product/Product.aspx?Item=N82E16819115042