Video BIOS image for a Sapphire Radeon X1300 with 256MB on the AGP interface, stored in a ZIP archive. The figure 450700 in brackets most likely encodes the default clocks of this version. A ROM like this is used to bring back an AGP card after BIOS corruption, either through ATIFlash or by writing the EEPROM externally with a programmer. Since X1300 cards came in many memory and interface variants, match the bus type, memory size and board before flashing, and back up the existing firmware first.
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 .zip file
Compressed archive that every operating system opens without extra software.
Back up your own chip before writing any dump, and match the full board number and revision. Flashing guide →