Actually NO! DDR3 did give more room for overclocking since it can run at higher speeds. 775 processors don't have to depend on unlock multipliers.
Phenom II will need more bandwidth coming and going to and from the cores. So yes DDR3 will help. Also note that DDR2 is about about dead as DDR1 was when Intel moved to it as well. The economies are the only thing slowing down adoption of DDR3 as it stands right now.
Note, if BOTH DDR3 and HT 3.0 doesn't help when they are Both tested together, AMD is in for a very rough ride indeed.
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