How come when I see in a review, "we measured peak system usage at 259 watts, so you must have a 450w power supply at the minimum." This makes absoutely no since whatsoever, cause even after you add the efficiency 450x75%=338w you still have a minimum of 75 more watts to play with. So you should only really need to have a 350w at the minimum. Then I see a review that says "our 1000w ocz powerstream wasnt enough for the 500w usage in our gtx280 sli, so we had to upgrade to 1200w." This makes me LOL because you should still have AT LEAST 250 more watts to play with. 1000x75%=750w I mean seriously what since does any of that make? are the reviewers crazy?