M.2 Drive not showing in W11

sargan

sargan

sargan

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Joined
16 Feb 2019
Posts
141
I built up new PC ...
The primary M.2 (slot1) is a PCIe-5 module and working fine.

I have a 2nd M.2 module that is PCIe-4 that I wish to use in slot 2 (PCIe-5 slot)
Yet it does not show in Device Manager or in Disk Management.

Now the strange thing .. I moved it to slot 3 (PCIe-4) and it comes up in W11 fine.

As PCIe-5 is supposed to be fully backwards compliant, what do I need to do to get this to work ?
I thought it might be the Motherboard (Gigabyte X670E Aorus Master), so I exchanged the motherboard, and exactly the same fault on replacement board.
Is there something I need to set in BIOS ?
 
Last edited:
freddie64 said:
Does your Gen5 NVME work in the 2nd slot? (to rule out if it is working or not)

If you can't get the slot to work, RMA the motherboard and get a diffent brand.
Click to expand...
As per OP .. if I put M.2 in slot 2 (PCIs-5) ... nothing shows, if I put it in slots 3 or 4 (PCIe-4) then the M.2 does show
 
Agree .. slot 1 nearest CPU is working fine
slot 2 does not show M.2 when plugged in
slots 3 & 4 do show M.2 when plugged in

As slots 1 & 2 are PCIe-5 wondering if they have to be the same .... you can use PCIe4 or PCIe-5 but not mix them ?
Goes against the idea that PCIe5 is fully backwards compatible
 
Yep ... W11 running from M.2 in slot 1 (PCIe-5 module & slot)
Blank M.2 (PCIe-4) in slot 2 does not show (PCIe-5 slot)
If it put module in slots 3 or 4 (which are PCIs-4) it does show up

I have raised tkt with Gigabyte in case it is a limitation that is undocumented.
 
OK ... now this is odd.
If I put WD PCIe4 in slot b it is not recognised
If I put it in slot a, c or d it is recognised.
I also tried The Crucial PCIe 5 in slot b .... it works fine, and if put WD in slot a it works

With no real way forward to get slot b working with PCIe4 when there is a PCIe5 isn slot a ..... starting to look like Freddie64 comment in #11 that
Slots 1 and 2 use CPU lanes so may lock them to gen5 if one is used.
Slots 3 and 4 use chipset lanes.

May be the issue ..... as within refund period ... returned WD M.2 to Amazon, and ordered a 2nd T700 PCIe5
So hopefully this will work
 
OK update on this .... WD support engaged and they run some tools and advised me to return M.2 for refund - not supported on Gigabyte Motherboards
So I returned that and bought another Crucial T700 instead - and that is working.
 
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