I followed a guide to mod my bios (amd tho) to unlock features and with a tutorial is kinda easy... like, just follow the tutorial, open this, change this to that... i don't know however whether it would require a handmade mod for each bios or if a generalist tutorial would be okay for different oems mobos
Lower than that, much lower - as it required custom built/assembled BIOS, effectively. The hardware mod was the very easy part.