ASUS Pro WS X299 SAGE Motherboard, Socket LGA 2066, 8x DDR4 DIMM Slots (Up to 4266MHz OC, 256GB Max), 7x PCIe 3.0/2.0 x16, I/O 8x USB 3.2 Gen1, 4x USB 2.0, 3x USB 3.2 Gen2 (2x Type-A, Type-C), 2x RJ45, Optical S/PDIF Out, 8-Channel Audio, AMD Quad CrossFireX, NVIDIA 4-Way SLI, FF CEB, Storage 8x SATA 6Gb/s, 3x U.2 Connector, M.2_1 3 M Key 2242/2260/2280/22110, M.2_2 3 M Key 2242/2260/2280. Asus Intel LGA 2066 CEB Mother Board with Quad-GPU Support, DDR4 4200MHz, Dual M.2 & U.2 (WS-X299-SAGE) WS X299 Sage fits up to four dual-slot graphics cards and supports both NVIDIA® SLI™ and A