hmmm odd,i run a stick of each. 256 xms 3500 and 256 hyperx 3500
the hyperx is in slot3 closest to the edge of the mobo and xms is slot1 closest to the cpu.
ive had no issues what so ever with my rev2 nor did i either in the rev 1.2
i didnt see any revision number on the hyperx tho.