i have a rig that i am expanding but have almost no knowledge of graphics cards,so i need some help getting the right one. I whant to run mw2 at about medium graphics and good fps rate. this is my rig so fare. Intel Celeron 2.50 GHz 1.2GB RAM NVIDIA GeForce FX 5200 MS window's sp3 100 GB hard drive i am hopeing to get a:H545H512 Radeon HD 5450 Video Card And upgrade to 2GB of ram. please tell me if i need to upgrade anything (if any) else so i can play. Ish1tsn0w.