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Socket 940 requires ECC Registered DDR RAM while Socket 939 doesn't. Socket 939 also benefits from a faster memory bandwidth. This results in Socket 939 processors that have less L2 cache and less clock speed than the Socket 940 processors actually having better performance. In a nutshell, Socket 940 was a move to keep AMD in the market temporarily in the super-high end users. Now that they've had time to design what they really need, Socket 939 is the way to go. AMD has actually discontinued processors for Socket 940.
-Lasereth
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"A Darwinian attacks his theory, seeking to find flaws. An ID believer defends his theory, seeking to conceal flaws." -Roger Ebert
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