This is my second time posting my experience, well yesterday i was curious to finding way how to flash my sapphire radeon 9550, 256mb ddr to 9600 pro. Thanks to this forum, i found that my 9550 is using Hynix 5.0ns, 128bit, well to overclock into 9600pro i need to find the same bios from this site.
After searching the match Bios, i can't find the Bios with the same speed memory (Hynix 5.0), so i turn into Sapphire Radeon 9600 Pro, 256mb, 128bit BIOS, and expecting that this kind of Bios might be work.
I started to Boot my computer with Bootdisk and save my old bios with Flashrom parameter. Next, i flash my card with the rename file 9600.bin (you might have to rename the file since MS DOS doesn't recognize long character), well the bios flash begin to start and took a few second to proceed.
After that some messages were appeared in the screen showing the bios flash has been sucessfully changed, also there were a funny tones from the cpu speaker after the flash process.
Well now i get a card based on 9600 pro (450 / 227.5) instead of (250/200) and saving USD. 50 in advantage. Not sattisfied on that changing, i'm using ATiTool to overclocking an overclocked card become (500/250). Well it did work, now i'm able to play any game (including HL2, Doom3) without crash, and the incremental of the FPS is significantly raise.
Well, this is the end of my posting, i hope this tips might be able to help someone with the same problem.