A 64-bit memory bus at 1066MHz would only be able to use half of the memory's bandwidth in dual channel mode. AMD processors have an integrated memory controller that does not suffer from bottlenecks the way current Intel chips do. Will the Conroe still be able to use 1066MHz DDR2? Yes, but you’ll only really get half of the RAM’s maximum bandwidth. Even in this situation the Conroe does perform very well, but it's not able to use memory bandwidth as efficiently as AMD chips.