This product is either discontinued or we cannot get that from suppliers.
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