[Request] asus ws w790-ace PCIe bifurcation

Hi i’m in desperate need to enable x8x8 in all of the PCIe ports.
I have tried unsuccessfully to mod the bios with AMIBCP.
can anyone help me with this?

if some one can unlock the PCIe as shown in the attached image i will be very happy!
Note: Bios version PRO WS W790-ACE BIOS 1202 from here:


Plenty of guides in the forum (from X79/99), besides the W790 a more recent mb model, still many info useful on those guides, use the search box in the forum.

The “leaked” versions of AMIBCP around usually will break the modern AMI Aptio V bios.
Alternative tool is the AMI UEFI Editor

Perform backups before any attempts of mod flash, to preserve mb original data.

already tried the AMI UEFI Editor but the ezflash is complaining that the bios file is wrong!

Off course it does… why such surprise?
Did you thought that ASUS and AMI, working hard on security…, just let you flash any modified files on a system? Ignorance is a bliss…

[Guide] How to flash a moded AMI UEFI BIOS - BIOS/UEFI Modding / BIOS Modding Guides and Problems - Win-Raid Forum (level1techs.com)

Your motherboard has USB BFB feature, that’s the most secure and correct option for that.

EZflash only for older boards, usually using old non-CAPSULATED roms.

1 Like

Thanks @MeatWar !!!
With your help i have manage to build/flash the BIOS successfully.
the modded BIOS is here: https://file.io/tAoqgbiphwaE and here: Download PWW790A_bif.zip from Sendspace.com - send big files the easy way