look in your motherboard guild for the ram. the ram has to be in a0 and a1. most times there the two of the same color slots. if you put them in the first two then you have one stick in a0 and one in b0. with ram it the speed..voltage and timing of the ram kits. also the ram kits should be on the mb tested list. myself i would not try to save a few dollars for a cheaper kit i would use 4 match dimms.