I'm looking to build an m-itx PC, and the Lian Li case I purchased calls for a PSU with a length of only 140mm. This drastically reduces the available choices, especially for modular PSUs. Silverstone has a 750 watt version, but the reviews are lackluster.
Seasonic has a very highly rated 550 watt power supply that meets the length spec, but I'm curious if you think that PSU is powerful enough (single rail, 45Amps, 550 watts, Gold certified). The Extreme Power Supply calculator says it is fine, estimating a draw 0f 431 watts under 95% load for the PC I hope to build. But I would like other opinions. Here would be the specs:
Gigabyte 787N Mobo (draws 65 watts, 127 under full load)
EVGA GTX 780 FTW (apparently draws 250 watts under full load?)
8 GB DDR3 1600 1.5V
1 samsung 256GB SSD- EVO 840
i5 3570 processor (no "k" version)
2 140mm fans
I have no plans to overclock the CPU, and there will be no optical drive or secondary hard drives.