Hey Ryan,

I have the exact same Asus P8H67-M LE motherboard, any chance you could upload your modded BIOS file...?

Hi all please move my post if it doesn't fit this thread. Using Modded UEFI from this guide I was able to make ADATA NVME PCIex4 V3 bootable on i7-2600 / ASUS P8H67-M LE Rev 3.00 . Running Windows 10 2004 build on UEFI. This post can be searched to verify that this setup works. Everything works except the negotiated speed is at PCIeX4 @ PCIe V1. I want the NVME to run at PCIe V2 since that is the max the PCH can support. The user manual for H67 states the PCIex4_1 slot is capable of PCIe V2. I tried installing the PCiex4 to NVME M.2 adapter card to the CPU's PCIe x16 slot and it was able to run V2 @ 1600MB/s on diskmark. However, the PCH's PCIex4_1 slot is limited to V1 at 800MB/s. I also tried disabling as many devices that are linked to the PCH such as the SATA and USB 3.0 controller in the UEFI, but same V1. If you have a similar chipset and V2 worked on the PCH's x4 slot please PM or reply to my post. The controller for XPG S11 Pro NVME is SM2262 . Lastly I would like to thank @Fernado for finding this awesome solution, you are an amazing person to have figured this out! If you don't have dream job yet, some advice would be to link these posts to your LinkedIn resume and let the headhunters do the job hunting for you.

Sincerely,
Ryan