Hi! I will soon (within the next few weeks) be upgrading from a 6600GT 128mb to a x1800XT 512mb. I currently have a 400w PSU (Codegen 300x) and its powering: Asus K8N4-E motherboard 1.5 GB Ram a 160GB & a 320GB Hard drive 1 NEC 3540A DVD RW Drive Geforce 6600GT I'm assuming that my PSU will not have the required wattage to run (or properly run) a x1800XT. What is the minimum wattage you would recommend? Also, which PSU make/model would you recommend? Thanks a lot!