Get rid of that power supply immediately and buy a quality unit. Attempting any sort of modification on your GPU could be disastrous. That unit is among the worst of the worst.
http://www.tomshardware.com/forum/id-1804779/power-supply-unit-tier-list.html
Tier 5 - Replace immediately. These units are NOT recommended for any system, no matter the purpose. Reference to higher tiered models for a better and potentially money-saving unit
The CoolerMaster Extreme series comes under that category.
Buy a quality 500-600W XFX, EVGA, Antec, Seasonic, Corsair, Superflower, Enermax or Silverstone power supply.