I have 3gb of 1600mhz dominator, I won't shot of. I'm going to upgrade my os soon so I wont more then 3gbs of dominator, but I can't get a replacements an till I have more money. should I ebay or keep as a back up? if I keep as backup I will end up with a lower budget, and still wont to stick with corsairs dominator, but should I go 2nd hand for a 6gb kit? whats the 2nd hand market like for ddr3? should I risk 2nd hand parts?