I know, I was not expecting it to work. I have a highpoint 1701 and Evo 970 Plus 1TB.Strange, so it works on your side on Big Sur without any additional software? May I ask what device / adapter you are using? Maybe this is also connected to the PCI card itself.
No extra software other than OC 0.6.3. The only thing I changed with the OC config and kexts was adding innie to Lilu via the plugins method.