I used to used eXtreme Power Supply Calculator religiously. Until I got a kill-a-watt tester. And Also noticed they updated their website... Lo and behold my system now needs more power! by 100watts!!~ WTH I feel the new update is just money grubbing EVGA partnership since it doesn't even quote other brands or plantium series. Also feel cheated by the old design and the new one since I got a Kill-A-Watt tester now.