@WolfgangBlub I used this to extract the part of the bios file with the rebar option: Releases · LongSoft/UEFITool · GitHub
Then I used this to convert it into human readable text files: Releases · LongSoft/IFRExtractor-RS · GitHub
Then I searched each text file for rebar and found the settings.
This is what i found in the 12th 3.06 bios:
0xE2E45: OneOf Prompt: “PCIE Resizable BAR Support”, Help: “Enable/Disable PCIE Resizable BAR Support”, QuestionFlags: 0x10, QuestionId: 0x7CA, VarStoreId: 0x2, VarOffset: 0x42B, Flags: 0x10, Size: 8, Min: 0x0, Max: 0x2, Step: 0x0 { 05 91 5D 14 5E 14 CA 07 02 00 2B 04 10 10 00 02 00 }
0xE2E56: OneOfOption Option: “Auto” Value: 2, Default, MfgDefault { 09 07 90 13 30 00 02 }
0xE2E5D: OneOfOption Option: “Enabled” Value: 1 { 09 07 91 13 00 00 01 }
0xE2E64: OneOfOption Option: “Disabled” Value: 0 { 09 07 92 13 00 00 00 }
In addition to what is in this thread I also used this post on Reddit: https://www.reddit.com/r/eGPU/comments/wx5g0f/my_adventure_in_the_attempt_of_enabling_rebar_on/
The person who posted that has the same result as me though, the option is set to enabled in the bios now but still says it is not in CPU-Z, I don’t know enough about how it works to have any idea why.