Firmware for the Sapphire Radeon X1300Pro PCI-E card with 256MB of memory, in a RAR archive about 80 KB in size. The code 600800 probably stands for the core and memory frequencies stored in the ROM. Technicians apply it when a card has a damaged or mismatched BIOS, reflashing via ATIFlash or a dedicated SPI programmer on the onboard chip. Check that interface, memory amount and memory type match your card, as Pro and non-Pro variants differ, and save the current ROM before any write.
The button opens the matching file on RM Schematics, or a source page if it is not catalogued there yet. The original attachment is from @biosarchive. Enginerys does not host this file.
How to open a .rar file
Compressed archive — the usual wrapper for a schematic + boardview pair or a BIOS + EC set.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →