Ok i have 2gb of Cprsair 667mhz Value select ram, firstly should i upgrade i game but i use XP pro, 2 if i get 2 more gb should i buy a 4gb kit of hyperx 800mhz ram and chuck corsair out or buy and add 2gb of the same. And yea i do overclock E2180 is at 3.3ghz ATM.
Get 4GB of Corsair XMS2 instead, work out if you'll ever use PC8500 speed, if you will, by that, if not get PC6400.