ASUS KGPE-D16 PCI-e lane bifurcation

[U'll Be King Of The Stars]

Hi all,

I'm considering adding two M.2 22110 NVMe x4 SSD's in software RAID1 to
a D16 using one dual-M.2 adapter card.  Most likely it would go in an x8
slot, I guess.

Does the D16 with blobless coreboot support simple PCI-e lane
bifurcation (x8 = x4 + x4)?

Or do I need an adapter card that has a PLX switch?  Thanks!

Kind regards,

Andrew