So I got 2x4GB Corsair1600Hz DDR3 and I want to put another 2x4Gb to have 16Gb, is there gonna be a compatibility issue? I've got some older 2x2Gb ddr2 1600 but when I try to power the pc with all of them it bips and auto shout downs, now idk if I go and get another set of 4Gb but different brand will it do the same? Thank you