Looking at todays deal, I am thinking of getting the 8gb xms3 on offer. I was looking to replace my current 2x2gb xms3 with the 2x4gb xms3, but thinking about it, how well would 12gb run? 2x4gb + 2x2gb? I guess I would loose the "dual channel", but what else? Would the 8gb run better by itself, rather then 12gb?