Best processor for AM3 Socket

For now, the most efficient is the Phenom II X4 965 BE. Be careful, there are 2 models: the old one with a TDP of 140W and the new one with a TDP of 125W. It is the new one that is the best.

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You don't know, you ask, you are ashamed once.
You don't ask, you will be ashamed your whole life. Chinese proverb.

Well, a quad-core preferably, otherwise a microprocessor with 3, 2, or 1 core.

Do you want a quad-core or does it not matter?

No, there are no AMD processors with 4x2 MB of L2 cache memory.

Hello, take the most powerful AMD Phenom II X4 and that's it :)