Some power consumption info

[vex]

Powercolor 280x 1030-1065MHz/1500 @ 1.03-1.065V (undervolted to a “sweet spot” regarding GPU frequency). Getting 700-730khash.

Gigabyte B75 something mobo D3V if I remember correctly

Mobo+CPU+RAM+3.5"Disk 80W AC (estimation 70W DC)

2 GPU Rig 450-500W on AC side - Corsair cx750 PSU.
3 GPU Rig 750-780W AC - Enermax 860PSU
4 GPU Rig 1000-1050W AC - Seasonic [s]1200W[/s]1250W

Measured on AC side, so actuall DC consuption is 10-15% less than these numbers, meaning the PSUs might be less powerful/expensive than the most figures I found online, it’s 180-210W per GPU.

[vex]

[quote name=“dLight26” post=“54994” timestamp=“1390669591”]
GIGA R9-280x @ 1050MHz at 1.05v~1.075v w/710~720kh/s
4 GPU = 1050w AC on seasonic 1250w

It was 1400w AC at stock volt - 1.2v.
[/quote]

So almost the same numbers. I got one of those gigabyte 280x and I got best results with 1065MHz GPU clock.
I’m thinking about adding a 4th GPU to the rig powered by 1050W seasonic, should be enough, and it’s got 7 year warranty.