No, I don't know everything and yes we don't need your comments when they're not factual,
and in fact misleading and doing a disservice to the original poster, whom we are trying to help.
Yes, the 245w is tot system rating for 1 card, but you don't double the watts
for cpu, hdd, ram, opt drive, fans, etc, they only get counted once. when you
add a 2nd card you only add the watts for the 2nd card, in fact unless he has water cooling
or something else that draws a lot of power, that rig with the 2 660ti's, proc, 3 fans, 2 hdd,
2 sticks ram, 1 opt drive draw less than 450w.
Tom