B550M Steel Legend not finding m.2 (2nd slot)

WiFi slot shouldn't affect the second NVMe slot.
The only two things I can think of are:
1) Crucial P3 and WD 770 Black don't work in x2 slots.
2) Broken motherboard/chipset.

I have that exact motherboard, and have 970Pro in the first NVMe slot and SK Hynix P31 in the second NVMe slot. P31 is of course running half max speed since the second NVMe slot only has 2 PCIe lanes. Note I'm actually using first 4 SATA ports also. Of course, I'm not using 5th and 6th SATA ports.

I know 970Pro works fine with just 2 PCIe lanes also because I have another one in a different PC doing exactly that.

Some things to try.
1) Go into BIOS and look for anything that might help. For example, disable all SATA ports since you're not using them anyway. Considering I'm not having this problem while using 4 of the SATA ports, it's unlikely to help, but well, it costs nothing to try. And it's just an example. There may be other BIOS options that could affect it. In fact, load default settings and see if it helps.
2) Make sure SSDs are actually functional.
3) Temporarily remove the WiFi card to see if it helps. I don't think it would, but since I'm not using my M2_3 slot, maybe it can affect things.
4) If you can use PCIe_3 slot, get a cheap PCIe m.2 adapter and put the SSD on that. You'll actually get better performance that way because PCIe_3 slot gives you full x4 lanes and is direct to CPU, rather than through the chipset. <-- EDIT: I was WRONG here: PCIe_3 slot is through the chipset also, not direct to CPU, because the CPU only has 16 (to PCIe_1 slot) + 4 (to main m.2 slot) + 4 (to chipset). However, the PCIe_3 slot is still x4, so it can be faster than the M2_2 slot, which only has x2 lanes.

Can't think of anything else at the moment.


Edited by eccential - 10 Jul 2023 at 9:37pm