Card Manufacturer: ATI Sapphire
Card Model Number: 5830 Extreme 1gb
Card OEM:
MHash per Second: 279
Core Clock: 925
Memory Clock: 180
Average Operating Temperature: 68 °C
Ambient Temperature: 30 °C
Fan Speed: 20%
Host OS: Win7 - 64bit extreme
Driver Version: catalyst suite (minimal installation) 11.11
Mining Program: cgminer 2.6.5
Command Line Flags/GUIminer Settings: -k diablo, worksize: 256, vectors: 1, intensity: 9, gpu-threads: 2
Other Information: 4 cards, seperated by 1x-16x pcie riser, without plastic on the fans. sempron 140 (unlocked to athlon II X2 4400e) and some 900watt psu. GPU vddc 1.065 V

Anyone could tell me why my cards only run around 279? I tried bamt with phoenix, it gave me about 300mh/s on same settings. Phoenix on win7 will give me like 850-900 only (maybe because i cant overclock properly). Any other kernel performs worse (using diablo).

Please anyone?