QUOTE Anyone know if the upcoming dualcores will be socket 939? Dual-core processors will be released for Socket 940 (Opteron series) and Socket 939 (Athlon 64 FX series). QUOTE Will they be compatible with DDR2? No.
Most likely, you won't see DDR2-support on an AMD-platform before 2006 when it'll actually make sense to endorse DDR2...also, DDR2 would probably require a new Socket.
Right now, DDR-2 memory is NOT faster than high-end DDR-I memory, because it currently suffers from very high latencies which significantly reduces its efficiency. Furthermore, a 'stick' of DDR-2 memory costs considerably more than a DDR-I 'stick' with the same capacity and equal or better performance.
At this point, DDR-2 memory provides neither enough raw bandwidth nor bandwidth-efficiency, let alone an acceptable price-performance ratio to justify a move from DDR-I to DDR-2 with AMD processors. Therefore, it doesn't really make sense to redesign the Athlon 64's on-die memory-controller to accomodate for DDR-2 memory at the moment.
Future AMD processors and platforms will support DDR-2 memory, but only if it makes sense...which will probably be the case around 2006.
In my opinion, not supporting DDR-2 at the moment is a good decision as it saves us users a lot of money (for buying expensive DDR-2 memory and new motherboards) and AMD platforms will still outperform the competitions' DDR-2 platforms by a comfortable margin for the simple reason that the integrated memory-controller's low-latency and the absence of a 'Frontside Bus' on the Athlon 64 results in much better throughput and efficiency.
------------------------- The opinions expressed above do not represent those of Advanced Micro Devices or any of their affiliates. <center><font color=red>MODERATOR</center></font> AMD Athlon 64 X2 6000+ 89W :: Asus M2N32SLI Deluxe :: 2x1024MB Muskin XP2-6400 DDR2-800 :: BeQuiet! Darkpower Pro 530W :: 2x WD Raptor 74GB/10k rpm, RAID 0 :: ATI Radeon X1950XTX