First of all, are you running any fans '7 volted'?
If so, don't. Doing so shifts loading which should be on the +5V rail to the +12V rail. Better to use a rheostat or other fan controller to control fan speed in your case.
The best way to load the +5V rail is to get yourself a highend video card and overclock it.
You could load the +5V rail with a one Ohm resistor to add an additional 25 Watts of load to the rail, but the resistor needs to be rated for it and it will need to be cooled.
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