https://www.techpowerup.com/242082/s...-d-motherboard

SUPoX introduces a professional crypto mining motherboard, SUPoX B250A-BTC D+, that takes advantage of the Intel B250 chipset for native 8-graphics card support to eliminate the need for riser cards. In addition, it can be used with server power supplies (single 12V rail PSU) which gives more options for scalable mining. Without the need for riser cards, the initial setup cost is lower (a savings of US$7-$10 per riser card) and lowers the overall power consumption. The mining rig is more stable as less heat and less clutter improves airflow, which ultimately prolongs the life of the mining system.

The Intel B250 chipset enables the B250A-BTC D+ to run up to eight native PCI-e X16 slots, which has many advantages over PCI-e bridge solutions. Miners can save on the cost of having to purchase multiple riser cards and have a more efficient overall system. It also has better reliability and stability, as additional riser cards run the risk of burnouts and capability issues that can affect the downtime of the mining rig.