the speed of the ram with ddr3 intel for sandy bridge had 1333 as the max standard clock speed. anything over that was overclock or xmp profile. with ib chips it now 1600 at 1.5v it up to the mb vendor to test there mb and ram. i would email both intel and gskill to see if the ram been tested. intel tested ram is very small sample. not all mb ram guilds will be up to date. sometime you have to email there suport people or post on there forums. myself for a stable system and cost would be to buy s good pair of 1600 ram. your not going to see much in way of speed.