I have GPUs pulling 350-360watts (29-30amps). I wasn't under the impression that the KNC modules were pulling that. I could be mistaken.
You surely must be mistaken:
What GPU pulls 350W?
How many cables are you using per GPU?
Are you aware that the PCI-E slot provides 75W of the total power?
Are you using powered PCI-E risers?
When you answer these questions you will understand that each 12V circuit on the GPU cabling uses less that the KNC board
I run banks of 7970 GPUs pulling up to 450w _EACH_... yeah, it adds up.