As I understand it, there is a very good reason why AMD has taken so long to release a DDR2 unit: because of the different (read "less sucky") arcitecture, the AMD chips benefit only marginally from DDR2 so they made it a low priority. This is why DDR2 Athlons have taken so long, and this is also why they won't make any difference worth talking about when they arrive. The P4, on the other hand, lives and dies by its RAM speed. (What else could you expect with a bizarre cache design and cripplingly slow task-switching?) That is why Intel (instead of AMD, who used to do this stuff back in Athlon Classic days when the boot was on the other foot) are always the firm to push bus speeds and RAM speeds higher first these days. Summary: the P4 needs DDDR2, the Athlon 64 doesn''t particularly care either way.