If you order some cards, order the ones i mentioned in the comments at your last post. The MSI cards are the coolest and using the lowest power. The old cards you use in the rig you ordered are using way to much power.

Check this Video:
https://www.youtube.com/watch?time_continue=7&v=mYoTrdJ-HNw

Its the 470 model, if you choose this one, be sure to get the 8GB version