I'm looking to get a new graphics card and power supply. The power supply I'll be getting will be either 450 or 575 watt, as for the graphics card I want to get a NVidia GTX 750 Ti (really having a hard time finding) but not sure it will go in my computer and after searching online I could find no up to date list of what cards can go in a Gateway DX 4831. I'm running windows 7 with 6GB of DDR 3 ram and I would like to play a few games in high to very high settings, and my screen resolution is 1600 x 900. Can anyone help?