Nice setup, I have the same thing only 3 cards on the rig atm though.

WU settles in around 1330-70 with 1.2% rejects on a 1024 diff pool so far.

Cards are running 470kh/s @ I-18 pulling 540-560 watts total for the rig, running BAMT 1.2.

They will do 485kh/s+ but seem to lose some efficiency with higher rejects, might need to tweak TC a little more.

Mine could probably be more optimized though, still decent for the cost/power.