My boss wants to upgrade one of the kids PCs, currently he has an FSP 350W running an i5-3530 (stock + stock cooler), 1 HDD + a Geforce GT 620. Any ideas of one of those FSP 350Ws (was a novatech built PC), is beefy enough to run a r9 280 or GTX 760 - Or should I tell him to go for a 500W PSU as well (was looking at an EVGA one for £45 ish)