hi all, i need some advice, i am concerned weather or not that my psu is powerful enough to run my setup, my pc contents are amd 8320, gygabite 990fxa ud3 mobo, 8gig 1600mhz ram, 2x 6950,s is crossfire, akasa venom cpu cooler, 2x dvd rewriter drives,7200rpm hdd, 4 case fans and finally a corsair tx850 psu, i have looked around and tried a few psu calculators and most of them say 900+, are they reliable as im running my pc fine at the moment, BUT am i putting too much strain on my psu, cheers guys, look forward to some sound advice to put my mind at ease