charrua;
Your power supply should be fine. But make sure that you have a MB that supports PCI-Express. The GForce 8800 GTS with 640 MB is a great card. My Microsoft Flight Simulator X-Deluxe runs pretty fast. Frame rates are around 20-25 with all settings on high. Check your memory speed. Hopefully you have sims with 800 mHz. Makes a heck of a difference.