Intel Core X-Series Processors Family :
1 x ROG DIMM.2 Module support(CPU_DIMM.2)*, with M key, type 2242/2260/2280/22110 storage devices support (PCIE 3.0 x 4 mode)
2 x M.2 Socket 3, with M key, type 2242/2260/2280/22110 storage devices support (PCIE 3.0 x 4 mode)
Intel X299 Chipset :
1 x M.2 Socket 3, with M key, type 2242/2260/2280/22110 storage devices support (PCIE 3.0 x 4 mode)
1 x M.2 Socket 3, with M key, type 2242/2260/2280/22110 storage devices support (SATA & PCIE 3.0 x 4 mode)