I've recently got Snow Leopard running. It works with an ATi 4870 with 1920x1200 resolution, and hardware graphics. However, OpenCL does NOT work. The OpenCL benchmark freezes PC, iMovie Freezes PC, Magic Garageband Freezes PC. For a strange reason, I can't find anywhere a fix for this. Here are my specs:

Q9550 core 2 quad
Maximus 2 Formula
ATI Palit 4870 1gb DDR5

Im currently using Chameleon2 RC3 with PC EFI 10.4.1 . I keep hearing however, change the Dev-id, how do I do this? Any others experiencing the same thing, or people who have got OpenCL to work on 4870, please comment, any suggestions, post them up! Thank you SL

Bump.. also, updated top PC EFI 10.5, still no luck.

Hello, try this,
netkas.org Common instructions for 48×0 radeons and snow leopard
good luck

Thanks for reply. Sadly that did nothing.