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There was ATI Radeon 9600 Pro PC&Mac edition, it worked fine in Mac OS X x86(no tearing, QE/CI Enabled, there is DeviceId of such video in ATI kexts). As I heard, there is the way to change DeviceId of ATI cards by video BIOS flashing(overclockers are using this way to enable pipelines in Radeon 9800/X800 series).

Well, that was guy from forum.osx86.ru and he used special version for both Mac and PC(google for Radeon 9600 Pro Mac&Pc Edition). As much as I know, there was no such version of other videocard(too expensive for PC users and no profit for Mac users).

Here is instructions from this guy(at forum.osx86.ru his name is Niarlototep):

1) Download this.

2) We'll need bootable floppy(only 3 files: io.sys, msdos.sys and command.com). Unpack atiflash169.zip to there. And copy X800GT.bin to this floppy.

3) Boot from floppy and enter this to save your former BIOS:

 

atiflash -s <number_of_adapter> <filename>

 

(If you have only 1 adapter, then <number_of_adapter> - 0)

 

Usual command looks like atiflash -s 0 r480.bin

 

Then, to reflash BIOS, enter this:

 

atiflash -p <number_of_adapter> x800gt.bin -f -newbios

 

and reboot.

 

4) Unpack other folders of this archive to appropriate places.

5) Repair permissions:

chmod -R 755 /System/Library/Extensions/*

 

chown -R root:wheel /System/Library/Extensions/*

 

chmod -R 755 /System/Library/Frameworks/*

 

chown -R root:wheel /System/Library/Frameworks/*

 

rm -R /System/Library/Extensions.kextcache

 

rm -R /System/Library/Extensions.mkext

 

6) Reboot

 

7) To remove mouse tearing, install MouseLocator.dmg.

 

With this method, guy made work his Sapphire Radeon X800GTO(but lost 4 pipelines). Unfortunately, he hasn't told his DeviceId. Can anybody with unsupported by Koverg's patch X800GTO card try this method? I don't have X800 card right now. And you doing this on your own. Reflashing is always risk.

Edit: This was for PCI-E Radeon X800GTO 256Mb.

For X800GTO 512Mb PCI-E and for X800GTO 256Mb AGP here

His deviceid was 5d4f, and now it is 554d.

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