Hey, I'll answer this for you.
939 socket was the first socket used by AMD for dual-core processors, and unfortunately for the casual user, the CPU line ended with the 4400+ X2, which is also somewhat hard to find now. Fortunately, there is a solution if you're wanting higher speeds on a 939 board. The 3800+ X2 is the best CPU on 939 because of its overclocking abilities. This CPU can and will reach 6400+ X2 speeds if you're willing to put the time/money into cooling, but you could do this easily for less than what you'd pay for a 6400+. I'm running a 3800+ X2 939 at 2.6 ghz stable right now on simple air cooling.
If you're wanting anything in the 5000+ X2 series, you'll need to upgrade to an AM2 board, which means new board, new CPU, and new ram.. Can be pricey.
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