i bought g.skill 6GB ddr3 1600 ram, but when i run it at 1600, only 4 Gb is usable. If i run it at 1033, then i get all 6 GB. how much of a difference is between 1600 and 1033? yes, i use my desktop to play game. should i try to get all 6GB at 1600 (is driving me crazy) or just use it at 1033?