Question Asus Hyper m.2 expansion card and PCIe Lane question

[dan.monger]

Hardware involved:
Asus Crosshair VIII Hero Dark X570
R7 5800x
Asus Hyper m.2 expansion card
RX 6700xt GPU
Morning y'all,
I am pretty sure I am an idiot and didn't put enough thought into this before pulling the trigger. I recently grabbed one of the Asus m.2 expansion cards to increase my onboard storage; it's an x16 card, and therein lies the problem. If I understand everything correctly, the CPU has 24 dedicated PCIe lanes. 16 is usually reserved for a GPU, 4 for the NVME slots, and 4 for other PCIe peripherals. There's also the bottom x16 slot that is powered by the chipset instead of the CPU. So I thought that if I hooked the expansion card into that slot, it should work fine, albeit a little slower, but it doesn't. Disk Management only detects one drive out of the four, so it seems like that bottom slot is running at x4. What am I missing here? I apologize for the post being rather messy, it's early, and I am tired and frustrated.

 

[SkyNetRising]

What am I missing here?

Asus Hyper m.2 expansion card x16 (with 4 M.2 slots on it) requires full x16 connectivity.
On your motherboard only top PCIE x16 slot can run in this mode.
Also you can not use second PCIE x16 slot or top slot switches into x8 operation mode.
Third PCIE x16 slot operates in x4 mode.

So - put m.2 expansion card in top PCIE x16 slot and
put graphics card in third PCIE x16 slot.

 

[dan.monger]

Asus Hyper m.2 expansion card x16 (with 4 M.2 slots on it) requires full x16 connectivity.
On your motherboard only top PCIE x16 slot can run in this mode.
Also you can not use second PCIE x16 slot or top slot switches into x8 operation mode.
Third PCIE x16 slot operates in x4 mode.

So - put m.2 expansion card in top PCIE x16 slot and
put graphics card in third PCIE x16 slot.

Ok, I will try that. How will running the GPU on the chipset affect performance?

 

[SkyNetRising]

How will running the GPU on the chipset affect performance?

You can expect gpu performance loss ~10%-20% (depending on application and setting used).

 

[dan.monger]

hmm, as much as it sucks to have a decently expensive paperweight. I think the card is gonna have to sit until I can get my home lab set up. The responses were much appreciated. Thank you.