Bifurcation on Alder Lake mobos

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   Hi there.

I have an option to buy Asrock H670 ITX/AX or Z690 ITX/AX for home server. I have a pcie card with 4 nvme m.2 slots. Previosly tested this pcie card with b365m pro4 on my job and it just sees nothing. I wondered why and googled about pcie bifurcation, but manuals for any of that mobos silences about it.

Does h670 itx ax or z690 or any non hedt mobo for 12th gen Intel processors support x4/x4/x4/x4 bifurcation for main pcie slot? Or at least x8/x8? Is it planned or possible to add it with firmware update? Does it depend on processor? I have 12400t.

Thanks.

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comes4free Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 09 Jun 2022 Status: Offline Points: 35	Post Options Post Reply Quote comes4free Report Post Thanks(0) Quote Reply Topic: Bifurcation on Alder Lake mobos Posted: 09 Jun 2022 at 12:53pm
	Hi there. I have an option to buy Asrock H670 ITX/AX or Z690 ITX/AX for home server. I have a pcie card with 4 nvme m.2 slots. Previosly tested this pcie card with b365m pro4 on my job and it just sees nothing. I wondered why and googled about pcie bifurcation, but manuals for any of that mobos silences about it. Does h670 itx ax or z690 or any non hedt mobo for 12th gen Intel processors support x4/x4/x4/x4 bifurcation for main pcie slot? Or at least x8/x8? Is it planned or possible to add it with firmware update? Does it depend on processor? I have 12400t. Thanks.

ASRock_TSD Members Profile Send Private Message Find Members Posts Add to Buddy List ASRock_Official Joined: 20 Mar 2015 Status: Offline Points: 8862	Post Options Post Reply Quote ASRock_TSD Report Post Thanks(0) Quote Reply Posted: 14 Jun 2022 at 5:10pm
	Hi comes4free, Thank you for your post. H670M-ITX/ax and Z690M-ITX/ax can split the PCIe x16 to x8/x8. Please select the option "riser card support" to x8/x8. All the best ASRock TSD

comes4free Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 09 Jun 2022 Status: Offline Points: 35	Post Options Post Reply Quote comes4free Report Post Thanks(0) Quote Reply Posted: 15 Jun 2022 at 4:47am
	Thank you for reply! Already bought h670m and tested that "riser" option. 4x4 card with 2 NMVe drives attached still unaccessible anywhere. On my primary PC mobo (x299, msi) it worked after splitting x8-x8 and enabling PCIe slot for VROC. How I haven't 4 identical drives to test, haha. Is there any way to attach 4, 2, even 1 NVMe m.2 drive via PCIe x16 graphics slot to h670 in addition to two Hyper M.2 slots? Or it really can be done only on HEDT/Xeons? Don't want nothing Intel RAID, pass-thru will be enough. By the way, is it possible in future to split 4x4 on h670 with some another FW or there are some architecture limit? Again, thank you very much for your attention.