(AGP) Nvidia 6800 GT Ultra 256mb DDR3 ram, will it run smooth with my setup?

It should work fine, but is that a 1 core? if so you wont be able to run games very good, but the GPU will help quite a bit. However your power supply to low. Just wait tell you can get a new setup, trust me i waited 2 years to get my setup, its worth it.