PCIe Gen 4 Storage AOC in Gen 5 slot

[v3locity]

Hi,

Was wondering if anyone tried using a Gen 4 Storage AOC in a Gen 5 slot?

Thinking of using a card like the AOC-SLG4-4E4T (PCIe x16 to 2x SlimSAS x8) in a motherboard with a Gen 5 slot (eg X13 Supermicro boards) connecting to Gen 4 NVMe drives.

Thanks in advance.

[Exard3k]

Shouldn’t be a problem. PCIe downgrades the generation automatically. If there is a problem, you can always change the BIOS to manually set PCIe4,3 or whatever. No one actually uses PCIe 5.0 hardware in their PCIe 5.0 slots atm

[jode]

The card cannot use more lanes that electrically offered by the mobo slot.

No, a 16-lane PCIe 4.0 card will not work at full speed in an 8 lane PCIe 5.0 slot.

That’s another common question on this topic.

[v3locity]

Yep understood. Was planning to use it in a PCIe 5.0 x16 slot (on a Supermicro X13SEI-TF). Since it requires bifurcation, was just wondering if they will play nicely. Would’ve gone for the X13SEM-TF but at the moment MCIO to U.2 cables are impossible to get hold of.

[edge-case]

@v3locity

Would’ve gone for the X13SEM-TF but at the moment MCIO to U.2 cables are impossible to get hold of.

I just bought (and received) two of these:

PCIe Gen4 Mini Cool Edge IO 38pin to U.2 (SFF-8639) Cable 50 CM

Haven’t managed to get the Tyan motherboard (S8050G4ME-2T) to recognize the Intel P4510 attached to it yet though…