[Request] Mod ASRock Fatal1ty 990FX Professional BIOS

[MeatWar]

Then a simple PCIe 3.0/4.0 x4 should be used, now follow the guides:

[HowTo] Get full NVMe Support for all Systems with an AMI UEFI BIOS - Special Topics / NVMe Support for old Systems - Win-Raid Forum

[Guide] How to flash a modded AMI UEFI BIOS - BIOS/UEFI Modding / BIOS Modding Guides and Problems - Win-Raid Forum

That’s all regarding this subject, good luck, all the best.