The server PSU plugs right in (red pull tab facing away from the blades) and runs at a steady 799 watts. It is loud as crap and feels too heavy for the backplane connector. I would happily swap one for a regular ATX PSU with a 800w or higher ratting.
It went surprisingly smooth, no issues whatsoever. And it looks so much neater without all of those homemade plugs sticking out of the tops of the Blades.
The model I have is the HP DPS 800GB and it's actually very quiet but gets quite warm so I have a 120mm fan blowing in its direction. I also wonder if it can handle a full backplane. I have 6 Blade now and would like to fill it up if I can. It don't think ver. 2 Blades are using as much power as the old Blades since they don't hash as fast. But I'm not sure about that.
Also, where can I get two pin fan connectors that plug directly into the Blades? At least I'm assuming those are fan headers. Right now I have a brand new Corsair AX860 doing nothing but fan duty for the Blades while I wait for my KNC, lol.
Now if someone would just design a proper case, I'd be happy.