ive got a 5770 running GUIminer , puts out around 165mh/s seems to work ok with me
Driver Packaging Version 8.85-110419a-118908C-ATI
Catalyst Version 11.5
Provider ATI Technologies Inc.
2D Driver Version 8.01.01.1152
2D Driver File Path /REGISTRY/MACHINE/SYSTEM/ControlSet001/Control/CLASS/{4D36E968-E325-11CE-BFC1-08002BE10318}/0000
Direct3D Version 7.14.10.0833
OpenGL Version 6.14.10.10750
Catalyst Control Center Version 2011.0104.2155.39304
I'll have to check all my versions against yours and see if it'll work with them later, thanks!