Atleast the IMC is completely 'twisted' on BD

No trouble doing DDR-2400 24/7 (unofficial divider on Crosshair V) and much much higher with better cooling (due the fact that the minimum NB to DRAM ratio is 1:1 and high MEMCLK stresses the NB much more).

Shamino did DDR-2904 on a not_so_good A0-stepping BD (back in April).

I did not find any trouble doing DDR-2700 (Memtest stable) on Crosshair V once the bios was fixed.

"Underclocked" CPU, northbridge at minimum speed, DDR-2700:

Attachment 121187

CPU with a bit better clocks (NB too):

Attachment 121186

The bandwidth is ok I guess