Connect PSU to only graphic cards


I have a 650W GX coolermaster left over after connecting my whole setup to a 650W XFX power supply as the coolermaster couldn't run both my 7950 cards at full load without crashing.

Problem now is that the XFX 650W sounds terribly much ( it's running at full load ) and I would like to connect one of the GPUs to my coolermaster to ease the load. ( I also plan on adding more GPU's later anyway )

However, the coolermaster seem to not start if not connected to the motherboard also, is there any nice workarounds for this to trick it to start?
I've tried searching on the web but couldn't find any good solutions to this.

Any help would be greatly appreciated :)
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