They can also be powered on by soldering these connections (taken from RC board)
Small pieces of wire from ethernet cable work well for making these connections.
I personally prefer soldering the PCI cables on the PSU vs using breakout boards.
GLWS, these are awesome PSU's.
Yeah, i love them, they are all i ever used. I just upgraded my farms to all rackmount so everything i have now has a PSU built in. The farm is a ton louder with all the S4's, SP-30's, and SP-35's, vs. what it use to be with these little PSU's running but its much more organized.