well at the min iam running 3 gfx cards (275gtx's and 8600gt) and a oc'ed i7 with water cooling and 7 fans with a 850watt andits fine so it should be able to handle one 480gtx but if he want to go sli i would say go 1000w+
edit: nice spot mattjd missed that one
edit: nice spot mattjd missed that one