I've got a P4 1,4 GHz, with 512 MB of Rambus memory and the original GeForce 3 64 MB card. The system has a 230 watt power supply. My question is twofold. First, is it worth it for me(will I see a significant performance increase in new games) to switch to a GeForce FX 5600 or a 9600 Pro(don't know which to choose)? Second, can the system handle it? Is the 230 Watt power supply enough? I imagine it isn't enough for the 9700 Pro or other high-end cards?