What temp you running that thing? Been trying to tune my rigs (290x) and they run hot as hell so I tune them down to keep them at around 85C. You get more than I do per rig.
My MSI R9 280X stays at 82c at 40% fan speed. It's using a small engine overclock (1020/1500 -> 1040/1500), and is mounted in an ATX case with the side partially removed to improve airflow. Multiple cards in proximity would obviously result in higher temperatures.
This has been pointed out before, but middlecoin calculates moving average using your submitted shares. The US East server tends to reject fewer shares, resulting in my moving average showing up to 0.82 Mh/s when cgminer only reports 0.72.
Interesting, might have to revisit my air flow solutions and stop underclocking. My fan runs at 45%. My WU seems to be higher in USEAST, maybe because it has the best ping for me.