August 22nd, 2017 
CryptoBadger Asus has announced plans to release a motherboard aimed squarely at cryptocurrency miners. The new mainboard will be dubbed the B250 Expert Mining and features a whopping 19 PCIe slots. In addition to theoretical support for up to 19 GPUs, the board features a unique power setup and diagnostic tools designed to make troubleshooting initial setup easier. Sounds like ASRock’s H110 Pro BTC+ board will have a short reign as the top pick for rig builds looking to maximize GPU count.
Anandtech posted an preview of the upcoming board this morning; head over there for some more details and photos.
Asus hasn’t yet specified pricing or a release date, but are expected to shortly.
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Does windows support more than 8 of the same gpu now? I was looking into getting the12 gpu tb250-btc pro and wanted to be able to run the system in windows with the new amd mining drivers. Thanks!
8 is still the limit due to driver limitations. AMD is releasing an update later this year that will supposedly allow any number of GPUs to operate in a single system.
You can mix AMD and nVidia GPUs to get up to 16 into one rig today (assuming you have enough PCIe slots), as long as you don’t have more than 8 of either.