Help needed configuring 2 PCIe to NVMe cards on ASUS Z11PR-D16 dual LGA3647.

[Dnezar]

Hello. I recently acquired this motherboard, but I can't find much help online. Doesn't seem to be very common. I have 2 Supermicro AOC-SLG-2M2 cards I put in the PCIe x8 slots. They worked fine on my X10SRL-F board.
On the Z11PR-D16 only one is detected. The BIOS settings don't have much explainations in the manual. I tried to fiddle around with them. Tried some jumper configurations on the cards, but not luck so far.

 

[sam55todd]

Check manual/specification of your new motherboard if it supports PCIe slot bifurcation (from x16 to x4x4x4x4 mode) or (from x8 to x4x4 mode), it's mostly manual setting (with default to use all PCIe lanes for single device).

 

[Dnezar]

Check manual/specification of your new motherboard if it supports PCIe slot bifurcation (from x16 to x4x4x4x4 mode) or (from x8 to x4x4 mode), it's mostly manual setting (with default to use all PCIe lanes for single device).

With my Supermicro, there were such settings.
On this one, there isn't. It must support bifurication as it identifies the 2 NVMe SSDs on 1 card. The problem is configuring the board for 2 cards. It must be an addressing issue.

 

[RolloZ170]

The problem is configuring the board for 2 cards. It must be an addressing issue.

the address jumpers are specialy for supermicros auto bifurcation.
and note PCIs slots 1,2,3,4,5 come from CPU2(second)
IIO Configuration -> Socket1/2 is your place.

 

[RolloZ170]

if your Bifurc.options are hidden you have to do bios mod.

 

[RolloZ170]

Supermicro AOC-SLG-2M2 is from/for supermicro
afaik ASUS have they're own NVMe Riser with auto bifurc. for server motherboards.
( 90SKC000-M5XBN0 , 90SKC000-M2WAN0 )

 

[Dnezar]

With my Supermicro, there were such settings.
On this one, there isn't. It must support bifurication as it identifies the 2 NVMe SSDs on 1 card. The problem is configuring the board for 2 cards. It must be an addressing issue.

You're right. Turns out to be a bifurication issue.

 

[Dnezar]

if your Bifurc.options are hidden you have to do bios mod.
View attachment 39829

Thank you.
Your answers are very useful.
May I ask how you go about BIOS modding?
First time I ever heard of it to be honest.
Is it safe?