I have an emachine E116107 running Windows Vista An AMD athlon X2 4050e processor,3GB memory and the GeForce 615se nForce 430 graphics card....I the only game i currently play is rFactor and the performance sux. I have every graphic turned down and my frame rate is only about 30...What video card upgrade could i make to make? That would run on this system? Would a memory increase help? thanks in advance for any help!