Hi!
I have the same problem.
I have got a XFX 5850 black edition:
user@linuxcoin:/media/usb$ aticonfig --adapter=all --odgc
Adapter 0 - ATI Radeon HD 5800 Series
Core (MHz) Memory (MHz)
Current Clocks : 157 300
Current Peak : 765 1125
Configurable Peak Range : [550-775] [900-1125]
GPU load : 0%
Adapter 1 - ATI Radeon HD 5800 Series
Core (MHz) Memory (MHz)
Current Clocks : 157 300
Current Peak : 765 1125
Configurable Peak Range : [550-775] [900-1125]
GPU load : 0%
user@linuxcoin:/media/usb$
I am able to overclock from 765 to 775, or anything within the "Configurable Peak Range".
Whith AMDOverdrive I can change the range to set memory to 300, but I can't configure an higher value than 775 on core.
I have tried to cange the pcie mhz in the bios from 100 to 110, but the card still runs with 775 mhz...