Ive got my NF7-S and im about to RMA my crucial stick. Replacing it with Muskin L2 black. Should I get 2 of 256 or 1 of 512? There seems to be a general consensus that the dual channel for my board doesnt do much, and Im taking into consideration if I wanted to upgrade to a gig later. This is a gaming system. Only gaming. Thanks for your advice!