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Back in the early 2000s, enthusiasts discovered that many Radeon 9800 Pro cards used the same GPU as the 9800 XT. Flashing the XT BIOS unlocked higher clocks and pixel shaders. However, the EEPROM often required the 293 delay. Without it, the flash would corrupt halfway, requiring a PCI rescue card.
Sometimes you need to force an erase before writing: ati flash 293
atiflash -e -f -sst 293
(The -e flag erases the EEPROM contents.) Back in the early 2000s, enthusiasts discovered that
Authentic ATI Flash 293 modules are produced by: (The -e flag erases the EEPROM contents
Warning: Avoid "grey market" chips from online auction sites. Insist on original packaging and request a certificate of conformance showing -40°C testing.