today after long time with no test i've fired up the board with the 950 and 3x2gb kingston mgh-e-hyper...so, same config as always.
all was at air cooling, but the mobo at the first boot stuck on FF.
4 hours later i retried the board and this time it works "fine"...but...only with QPI in full mode.
when i set slow mode the board start and pass from F8 --> F3 --> F6 --> F8 --> some strange codes (e.g. d4 - that means nothing.......).
if i press reset button the mobo restart and this time boot apparently normaly but when i'm in windows with CPUz and CPU-Tweaker i ALWAYS see memory in 2:8 and uncore 16x.
there is no ing way to make it boot with another memory or uncore multiplier with QPI in slow mode.
and this occurs with bios S61A, 44 and 74 ALSO WITH LOAD OPTIMIZED DEFAULTS and only QPI slow mode and dividers modified by me.

in less than 3 months it gave me alot of trouble, every time there is something that doesn't work properly.........