I see a lot of server PSUs on sale for real cheap. I don't see the point in buying high end PSU anymore. All server PSU are by default 92+ efficiency and are made for 24/7 use. I found real cheap one, 800W for 20$. After a bit of modificationsi made it so it can power my GPUs.
What did I do ?
Soldered 2 pins so it stars right away when it's plugged in (there is no need for any button or anything...)
Soldered 2 wired (+ and - ) on the board and wired them outside so i can connect multiple 6-pin connectors.
How to get a lot of 6 pin connectors ? You can use 24 pin motherboard connectors from old PSUs, just cut them in peaces and connect them properly.
How all this look:
http://i.imgur.com/NvfugWx.jpgHope someone else will do this and save a bit of money instead of buying high end PSU !