as a total noob to Blender I had tried it out on my HP DM1 ( E-350 APU) and was very pleasantly surprised. Having experimented a bit with the software I thought I’d try and install it on my older but faster desktop (Vista32, 2GB, Phenom8450, HD4650). Which I did…
It loads just fine, appearantly, however when I go into the user preferences/system I am not able to select the HD4650 as a computing device. It just states NONE and only has the CPU available to render. I have tried the latest stable build of blender and the latest available development version in the .63 range and both exhibit this behavior.
I found the user preferences.py file and found this document: http://www.blender.org/documentation/blender_python_api_2_62_release/bpy.types.UserPreferencesSystem.html#bpy.types.UserPreferencesSystem.compute_device_type but there I get stuck. I thought I might be able to force the system into that mode, but I don’t know how/where/what.
I checked the systems list the blender developers are using and the HD4650 is on there, thus supported, according to that list. http://wiki.blender.org/index.php/Doc:2.6/Manual/Introduction/Installing_Blender
Can I be helped? Uhm… nah, that’s a lost cause… Rather my issue then?
edit: oh, and yes, I have tried several different GFX driver versions from the AMD support site.