I have two AMD's and one P4.
Between my two fastest computers (P4-2.8GHz and AMD 2400+) the AMD is noticeably faster (all other components are equal). I seem to get a lag on my P4 after a period of time (requiring a reboot) while I rarely see this happen on my AMD.
When it comes time to upgrade the P4, I plan on switching it to AMD and all of my machines will be AMD.
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