The new motherboard and/or BIOS 0703 is more unstable than the original SIIE with BIOS 0603. Will revert to at BIOS tested with the original MB
Trying memspeed 1800 8-8-8-24-2T gave BSOD and even 1500 is not stable within the rage om voltages tested.
Memtesting overnight at everything stock except primary memory timings and memory voltage (set to default as specified).
Have tried to disable SLI without luck. Will try to use only one graphics card.

Anybody else observing extreme jumps in the memory voltage reading in Asus PCProbe? I guess it is a software bug but my eyes nearly poped out first time I saw a warning message and a memory voltage of 3.3 V ;-)