Hello!

Big thanks to you guys!
After 2 days of hard trying (got only Black Screens or Glichy graphics) I finally got fully working Asus HD4670 512MB, ID 1002:9490!

My setup:
iATKOS S3, boot_flicker, monitor connected to DVI2VGA dongle (VGA out doesn't work, except when I plug DVI2VGA dongle (without monitor), but then I get fancy colors).

I also installed 10.6.4 update with success!

Steps:

1. Installed iATKOS S3 with integrated graphics card (because with HD4670 after installation I got Black screen, even in safe mode)
(options used: PC EFI 10.6, Graphics Enabler, voodoo HDA, NTFS-3G, everything else left by default)
2. edit /Library/Preferences/SystemConfiguration/com.apple.Boot.plist
add pmVersion=20 (in correct form) needed for 10.6.4 update kernel panic
3. rename original /boot to /boot2
4. extract boot_flicker and copy boot file to root folder
5. install updates
6. restart PC and change graphics card to HD4670
7. connect DVI2VGA dongle and monitor to it
8. Beautifully running MacOS

edit.

9. There is a Apple released kext update. Installed it and everything is still running beautifully!