Hi, Please can someone give me some advice about the correct order to do things to power a second graphics card with an external power supply in a Mac Pro. (I have looked lots on the internet, but people just say to do the paper clip trick, but I'm unsure about the order to do things in) I have just bought an corsair 550x power supply to use as an external PSU for my second GTX980ti in my Mac Pro. (The first GTX980ti is powered by the Mac Pro's two mini 6 pin connections). This is the order I am switching on the computer... 1 - External power supply switched on 2 - connect the PS_ON and GND pins on the ATX cable with a copper wire. 3 - Switch on mac pro. and then when I shut down the mac pro do I... 4 - shut down Mac Pro 5 - remove copper wire 6 - Switch off External power supply Many thanks for your help. This setup works but Just wanted to check. Also wish there was a better solution to switching on the power supply than using copper wire!