Just to check also, both should work fine I think.. Wont they? They are both 1.5v, and have the same timings. The frequency is also the same. The only difference is, the Vengeance is 2T, and the GSkill is 2N.
T and N are the same, but why not buy another identical kit to the one that you already have?
Well I was wanting lower profile RAM anyway, to fit under big air heatsinks, like the D14. My Vegence wouldnt fit, because its the one with the overly large heatsink, yet the Gskill will. And so Im not spending all my money at once, I'm just upgrading to the 2x4gb of Gskill to start off with, then buying another 2x4gb when I have some money spare, that I don't mind wasting, or another DDR3 motherboard that Im wanting to load up with some DDR3