Ram Advice?

[madrebel]

typically no running mismatched sticks is a recipe for problems. it can be done but isn't recommended by anyone.

CoD is a 32 bit app so it will never address more than 2GB of ram at any given time (actually the limit is about 1.7GB for 32bit threads). as long as you have 2GB of available memory then adding more won't do anything.

i wouldnt bother upgrading to different ram either as ddr2 is stupid expensive compared to ddr3. you can get 8GBs of CL7 ddr3 for like $45. if i were you I would wait for Sandy Bridge E and upgrade my whole setup then.