So I'm using m0mchil's bitcoin miner and I've had it working fine on the HD6850 @ 220mhash/s, and I've since added a second card in - a HD4850 I had laying around.

I'm having problems getting this one detected as an OpenCL capable device, I've removed and reinstalled ATI Stream SDK 2.3 as well as reinstalled video drivers + opencl driver, didn't make any difference.

GPU Caps Viewer doesn't list it as an OpenCL capable device either. Anyone know what could be preventing this from working right? It seems the 4xxx series doesn't support OpenCL properly but there are others in the thread claiming to be using 4800 series cards.