It's possible to raise gpu/ram frequency with a flashrom editor to match real core speed. http://thomas.perrier.name/graphiccelerator.html

I've read a pair of success stories using retail 128MB DDR ATI Radeon 8500 original boards that can be reflashed with ATI reflash tool and the full 128MB can be accessed. http://macosx.com/forums/hardware-peripherals/21413-radeon-8500-a-2.html

-edit- later I have read that when the 65th MB is accessed the system it will fail.

Here there are claims that roms don't support 8500 models with "square" package ram chips.
http://cubeowner.com/kbase_2/index.php?article=263

R8500 Mac Edition runs at 275Mhz so slower pc cards using right package may require decreasing gpu/ram frequency.

[ Edited by Crumb 07.08.2012 - 13:50 ]

Divinity,
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really ? :)

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I am having the same issue. Have two 9200SE cards (Maybe they are 9250?) And 2D is fine, but all 3d is broken. Draws random white lines and black background.

I have just flashed a 9200 256mb card and a 9250 256mb card, the 9200 has 128k and has been flashed with a 128k retail rim and works perfect in 2d and 3d in both morphos and mac os x, the 9250 only has a 64k rom chip and I used the hacked rom and that need drivers for os s but also works perfect under morphos in 2d and 3d and also shows as a 256mb card in both, I have tried doom3 and rtcw is there any thing else I can try that uses 3d?
I have some 128k rom chips but no idea what jumper to set to use them instead of 64k ones.
both cards are sapphire ones

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No need to change any jumpers, just replace the chip.

pega-1,
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you are right :)
I try the second time

ok after looking at the graphics card util it says 128mb under morphos.
I have tried 2 128k chips so far and both fail at 10000.

@pega-1

finally solved the shipment problem; see your PM

bye