You want the slots on the same channel to be as close as possible due to signal integrity reasons, this applies for all the different memory routing options. It's the same reason why motherboards with just one memory slot per channel are much better for memory overclocking, just even worse.Could that mean they would be best with more spacing between them on the motherboard?
The only thing QDR does is reduce the amount of power needed for clock distribution. Also, DIMMs have a "strobe" signal (basically a clock) for each 8/9bits word and the other end uses strobe edges to clock data in, can't do that anywhere as easily if those were changed to QDR.Isn't it time for QDR? (Quad data rate)
QDR isn't a very good solution for memory, the next step is to keep transferring on both transitions/edges but encoding multiple bits into each transition as different voltage levels (amplitude) instead, like PAM-3/4/8/16 and up (the number is the number of levels, so PAM-256 would mean 256 states, IE 8 bits per transition).Isn't it time for QDR? (Quad data rate)