HI,

Firstly I should say I am in the UK with 230volts supply, my rig is on a 32amp circuit with rdc breakers.

My Corsair Ax1200i psu's are platinum rated 90+

My 6 card rig runs on win8.1 64bit

It did not work straight out of the box with 5 or 6 cards 4 yes.

I had to remove the amd and or gigabyte drivers and go with the windows provided ones which also changed the cards in device manager from R9 200 series to HD7900 series, but it works and they are all clocking at 775kh/s undervolted by 20%

It was a headache the set up day, because I added 1 card at a time up to the 4th great when I added 5 and 6 it all went wrong but I got it sorted with in the day.

Now it has been mining none stop 24/7 for 2 weeks.

Axco.

Edit, I also have a 45watt 24" fan and the LED back lit monitor running of the same socket with the power meter in (similar to a killawatt)