HI, I have a 235watt psu (1 12v rail with 14 amps) and I have a intel core 2 duo e7500,4gb ddr3 ram, 320gb 7200rpm hdd and a overclocked 1gb 8400gs and I need to know if my psu can handle a upgrade from my 8400gs to this http://www.newegg.ca/Product/Product.aspx?Item=N82E16814103252 aperently the r7 240 has a max power draw 125w but requires 30 watts and 12 amps??? makes no sense to me can someone please help thanks