Just before the last market crash, motherboard manufacturer ASRock designed a Ryzen motherboard targeting GPU miners with 8 full-size spaced PCI Express slots plus an additional 6 PCI-Express-over-USB-cable slots for the typical Chinese riser cards. The design was shelved when cryptocurrency fell in value against state currencies once again.

I've been chatting with ASRock Sales to see if a group buy could be established to have ASRock do a production run and that's why I'm reaching out. I want to see how many of you would commit to purchase units even if just one, and the max price you'd be willing to pay. I won't be passing price points along to ASRock as they've only asked about quantity so far. My initial guess would be this would be just under $200 per board.

The model was X370 Pro BTC+ and the details page with specs is still up here:
https://www.asrock.com/mb/AMD/X370%20Pro%20BTC+/

Here's a photo of a pilot unit in the wild from a convention:
https://www.reddit.com/r/EtherMining/comments/8pcy2v/asrock_x370_pro_btc/

Before you raise your hand up for this, there are a few caveats:
- The dimensions of the board are not standard ATX. Custom chassis or framing may be required on your part.
- There is an M.2 SATA port, but not M.2 NVMe due to focusing PCIe lanes on compute devices.
- The board supports more than one ATX power supply for power, but ASRock has provided little technical documentation on usage.
- I will ask ASRock for UEFI updates (including AGESA) for at least a year following the purchase, but there's no guarantee they'll agree.
- If ASRock didn't already print this many units, it could take them some time to produce.
- I would be purchasing for North America territory, but would consider shipping internationally to those with a great deal of patience. If there's enough interest in another non-NA country, I could also inquire about direct-shipping some quantity to a trusted party in that country.