I have an older PC that has started crashing on newer games. It is a Dell Studio XPS 8100 w/ a Intel i7 860 @ 2.80 GHz and 8 GB of ram. The GPU I have installed is a Geforce GTS 450 w/ 2 GB. The PC has only a 350 watt PSU. Do I need to upgrade the power supply and the video card to run games like World of Tanks or Skyrim or Fallout 4? Or is this PC just too old?