No. No, no, no. Again:
With one 280X under full load in their system, their PSU pulled 352W from the wall outlet. They calculated from this power consumption test that their video card pulled 243W by itself. So, I will just add 245W to 352W for two 280Xs in Crossfire. This makes the PSU pulling 597W from the wall outlet. Their CPU was idling and the i5-2400 is a 95W TDP CPU, so adding 95W to 597W makes the PSU pulling 692W from the wall outlet. So, this means that if the PSU is 85% efficient while pulling 692W from the wall, then the computer is pulling 588W from the PSU. The gaming power consumption will be even lower, peaking at 525-575W.
Actually, it will be even lower than that because he will be undervolting both 280Xs.
Therefore, again (and hopefully for the last time), his PSU has enough power. Ok? Ok.
Please do not glaze over the fact that he has an i5-2400 in an H87 board. This means no overclocking. Also, please don't glaze over the fact that he will be undervolting both 280Xs. Ok? His PSU has enough power. Period.
Edited by TwoCables - 3/30/14 at 9:03pm