So this is my first thread so im pretty noob, but im upgrading from intel hd graphics, to a nvidia/evga geforce gtx 760; the problem is my PSU is 400w, whats required is 500w. Heres the psu im looking to buy... http://www.trademe.co.nz/computers/components/cases-power-supplies/power-supplies/auction-897080392.htm but how do I know it'll fit my pc? I don't know the case model but possibly can buy tomorrow, thanks!