Intel's Mini-STX form factor (also known as 5x5) offers an intriguing platform for builders trying to build the smallest socketed desktop PC possible, but compatible motherboards have so far been available only as parts of complete systems. ASRock is breaking that mold with its H110M-STX mobo. This tiny board can run any 65W Skylake CPU that can drop into the LGA 1151 socket.
Mini-STX systems have a standard port complement to go with their accompanying cases. That means we get one Type-C USB 3.0 port and two Type-A USB 3.0 ports on the H110M-STX, plus one USB 2.0 Type-A port and another two USB 2.0 ports from internal headers. The board also offers what appears to be an HDMI 1.4 output, a DisplayPort 1.2 output, and a VGA port.
For storage, the H110M-STX offers an M.2 2280 slot with four lanes of PCIe 3.0 connectivity, an M.2 E-key slot for Wi-Fi modules, and a pair of combo SATA ports that provide both power and data connections using a pair of included adapter cables. Builders can add as much as 32GB of DDR4-2133 memory using a pair of SO-DIMM slots. Buyer beware, however: this board needs an external 19V power adapter to run. ASRock suggests a 120W adapter for builders using a 65W CPU, and a 90W adapter for a 35W CPU.
ASRock didn't provide pricing info, but this board already comes as part of the ASRock Deskmini, a $139.99 barebones kit that includes a case and power supply. We'd expect the board alone to sell for less.