I have 3 pc's,quad core,i7 and an old dell optiplex gx280 SMT p4 H.T 3ghz 4gb ram and 915g crap (for business matters)...Just thinking to upgrade it a bit,thinking to buy 9500gt or ati4670 for it, Please tell me which psu will be the best for it (looking to get a 430-500 watt psu but don't know that is anything compatible with gx280 or not) and will 9500gt/ati4670 fit in it....??? as now I will use it for some hardware tests...that is why i am planning to upgrade the gpu