"If PCIE5 slot is occupied, M2_2 will be disabled"

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   I have an Asrock X470 Taichi Ultimate. I want to use all the PCIe slots (but not necessarily all the lanes) and both the M.2 slots for NVMe drives. But this board says if the third PCIEx16 slot is occupied, the second M.2 slot will be disabled. Is there no way around this? Like, why can't the PCIe x1 slots be disabled instead? Or a couple of SATA ports?

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dcelman Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 02 May 2023 Status: Offline Points: 20	Post Options Post Reply Quote dcelman Report Post Thanks(0) Quote Reply Topic: "If PCIE5 slot is occupied, M2_2 will be disabled" Posted: 02 May 2023 at 10:07pm
	I have an Asrock X470 Taichi Ultimate. I want to use all the PCIe slots (but not necessarily all the lanes) and both the M.2 slots for NVMe drives. But this board says if the third PCIEx16 slot is occupied, the second M.2 slot will be disabled. Is there no way around this? Like, why can't the PCIe x1 slots be disabled instead? Or a couple of SATA ports?

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 24398	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 02 May 2023 at 11:32pm
	I highly doubt it. If memory serves the lane sharing is not software (firmware). It is electrically wired that way in the PCB. This kind of limitation comes down from AMD/intel. To get that kind of functionality you typically need a workstation/server board and CPU. With modern hardware it is a lot more forgiving than it once was but beyond a certain point you need to start looking at workstation solutions. In many cases the only difference between a workstation board/CPU combo is the number of available PCIe lanes and cache. Your best bet would probably be a PCIe x1 to M.2 adapter to mount the extra m.2 device.