I wonder how you get so much higher hashrate on lower clocks than me:
Default Adapter - ATI Radeon HD 5800 Series
Core (MHz) Memory (MHz)
Current Clocks : 1000 300
Current Peak : 1000 300
Configurable Peak Range : [550-1200] [300-1400]
GPU load : 99%
Device [1]: Cypress [Radeon HD 5800 Series]
Current core voltage: 1.2000 V
Presets: 1.0000 / 1.0375 / 1.2000 / 0.9500 V
Core power draw: 83.61 A (100.34 W)
VRM temperatures: 107 / 109 / 101 C
[394.59 Mhash/sec] [4933 Accepted] [206 Rejected] [RPC (+LP)]
With these flags under linux and 2.4 SDK: -k phatk DEVICE=0 VECTORS AGGRESSION=11 WORKSIZE=256 FASTLOOP=false BFI_INT