i have a Thermaltake Pure power 480 PSU. will this be adequate to power a BFG7800GS ? currently running a Leadtek 6600GT with a P-4 2.4c running @2.8 on an ASUS P4P-800. yes i know all about the better, faster, stronger PCI-E but an upgrade is out of the question right now and want to game on for another year. i play mostly Joint Ops right now but plan to sample some newer games soon.