Finally got time to try out the adapter with a Minisforum DEG1 dock and the included cable. Slick setup, thanks @Kyle_Tuck!
My initial test was with an Intel Arc A380 based GPU, and it wouldn’t show up at all. Tried 2 different A380 GPUs, no dice. On a hunch, I started trying other cards, which did work about how I would expect
| Card | Card Limit | Actual Link | Notes |
|---|---|---|---|
| ASRock Arc A380 Challenger | PCIe 4.0 | - | Not in lspci at all |
| ASRock Arc A380 Low Profile | PCIe 4.0 | - | Not in lspci at all |
| PNY Quadro P400 | PCIe 3.0 | 1.0 x4 | Might be in power save mode? |
| Intel X710-DA2 (10Gbps NIC) | PCIe 3.0 | 3.0 x4 | Seems fine |
| Micron 9100 Pro SSD | PCIe 3.0 | 3.0 x4 | Benchmarked >3GB/s  |
This is all with the DEG1’s included OCuLink cable for now. Ordered a shorter one to compare, just in case.
Has anyone else used an Intel Arc based GPU successfully with this adapter (or any adapter)? Next weekend I’ll temporarily pull the RTX 3080 out of my desktop and see what it does, as that is the only other PCIe 4.0 GPU I have access to right now.
I have a suspicion the problem is the Intel Arc being weird, not the adapter/cable/dock; I’d expect a weak/marginal connection to simply train down to PCIe 3/2/1 rather than simply not show up like the A380 does.