720 MH/s @ 335W ~ 2,15 MH/J

measured with Voltcraft Energy Check 3000

Setup:

MSI GD70
AMD X2 250
2 GB Corsair XMS 1333 MHz
250 GB  Western Digital 2,5" HDD
HD 5850 rev 2 @ 850/150/1.088V
HD 5850 rev 1 @ 850/150/1.088V
PSU: Cougar S700  (230V EU/Germany)

Cooling/Case:
modified Cooler Master CM690 rev 1
1x Scythe Big Shuriken (passive)
2x Arctic Accelero S1 Plus
2x Noctua NF-S12B FLX
1x Noctua NF-P14 FLX
1x Noctua NF-P12-1300
2x Cooler Master 120 mm

temperature GPU: 55 / 42 C°
temperature System/CPU: ~ 32 C°

CPU undervolting/clocking: no
disabled onboard devices: Audio / Serial Port
GPU overclocking: 765->850 / 725-> 850
GPU over/undervolting: no
CPU Load: ~ 0-9%
GPU Load: 99%
Miner Software: cgminer 2.2.1
Driver / APP SDK: 11.12 / 2.5
OS: Windows 7 x86_64 Ultimate

Power Draw start up : ~ 380W
Power Draw boot : ~ 180W
Power Draw idle: ~ 130W
Power Draw mining: 335W