As appears in the Buyer Guide -> mini PCIe tab along with known issues and other pre-purchase questions.

Pros

At US$7 it much US$39 EXP GDC & doesn't require power stabilizing ferrite beads either

US$39 EXP GDC & doesn't require power stabilizing ferrite beads either uses a x16 slot to hold the video card, though mPCIe only has x1 electrically wired

does reliable Gen2 signalling, something that EXP GDC has been patchy at

Has a ATX jack, DC jack and 6-pin PCIe input power version to supply the 12V/75W slot power

Cons

Successful implementation videos with this adapter

Youtube video of it in action with an Acer 4755 under Win10

Mateus, the first video creator below, may submit a future implementation guide using this eGPU adapter. He's using the aforementioned blue USB 3.0 extender cable in this video with reliable Gen2 signalling.

NGFF (M.2) version

Also at < US$10 pricepoint, there is a newer PCE164P-N06 PCIe with SATA, 6pin and ATX input power connectors along with a different interface mating adapter (NGFF.M2). It's also been added to the Buyer Guide -> M.2 adapters.

NGFF.M2 adapter PCE164P-N03 Appearance Price US$ $7 & Max PCIe bandwidth 8Gbps – x1 3.0 (6th gen i-core CPU or newer)

4Gbps – x1 2.0 (2nd-5th gen i-core CPU)

Input PSU source ATX Cable type socketted Spare cable mPCIe ⋅ A+E ⋅ extension Vendor page – Implementations link

Longer or flat cable options

The supplied, somewhat inflexible round and short 60cm cable is something this solution could improve on. Here are some longer & flatter options found with web searches.

Notes:

1. This eGPU adapter's mPCIe/NGFF end looks to be using a mini-B USB socket.

2. The supplied cable has no markings to suggest it's USB 3.0 spec but has operated at up to Gen3 (8Ghz) speed here.

3. A shorter cable has a better chance of running at Gen2 or higher link speed. A longer cable has signal attentuation.

4. A flat cable may thread easier beneath your system and results in a physically stable system if sitting it on the cable.

A longer Gen2 compliant cable

For users wanting a longer cable rated at Gen2 link speed, there's a US$2 100cm USB 3.0 Superspeed mini-B round cable.

Flat cable options

No USB 3.0 versions were found. These USB 2.0 spec ones may be problematic with Gen2 link speed with a shorter cable more likely to have Gen2 success.

Please provide cabling feedback to this thread

If you go ahead with this cable purchase, please provide thread feedback so we know what works.