Originally Posted by Ropey
DDR2 is necessary for Intel to continue with the legacy front side bus. There are many pro's to the legacy front side bus and Intel does not want to be stuck to control on the chip. Rather than do that, they will move to more and faster cache ram on the chip and a higher data transfer from chip to legacy controller which brings the need for DDR2 (and higher to come). As bus speeds increase to 1333 and beyond there will be a profound change in operational data completion rates.
AMD has no choice but to move to DDR2 because (and this is simple business) Intel has the clout to change the platforms of the DRAM industry. AMD is now being "informed" by the DRAM fab companies that they do not wish to fab both DDR and DDR2 and the pricing of DDR will increase as DDR2 decreases. Thus they have no choice but to make this move even though it matters not with the extra bandwidth they have even on the DDR platform.