Here's my 6 x 280X GPU RIG with 4 x HIS IceQ X2 Boost + 2 x Sapphire Toxic running on Win 8.1 Preview.
http://i.imgur.com/gfTV0tp.jpg
http://i.imgur.com/7YEIf0w.jpg
http://i.imgur.com/3M2W4lM.jpg
http://i.imgur.com/MghPHiI.jpg
http://i.imgur.com/gfTV0tp.jpg
http://i.imgur.com/7YEIf0w.jpg
http://i.imgur.com/3M2W4lM.jpg
http://i.imgur.com/MghPHiI.jpg
your psu is a epic win
my god these evga 1500 are expensive