i currently have 8gb (2x 4gb) of vengence C8 ram, due to my cpu cooler i am unable to fit another set of normal vengence (cooler blockes the first dim slot), will there be any problems if i was to get the vengence low-profile 8gb set which is C9? would i be able to run the LP at C8? or would it be better to run the C8 set at C9?