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I have a Dell XPS400 with a Pentium D 820 2.80ghz cpu 800mhz. I want to upgrade to a 3.2 or 3.4 ghz. I don't want to upgrade the system board so I want to stay with a pentium D as I have found there are still alot of them around. My question is how do I figure out which cpu model# will work on my system? OS is XP media center. Thanks.