This product is either discontinued or we cannot get that from suppliers.
ASUS X99-E WS/USB 3.1 LGA 2011-3 Motherboard, Intel X99, LGA 2011-3, 8x DDR4 DIMM (Max128GB), 7x PCIe 3.0/2.0 x16, 2x SATA Express, 1x M.2 Socket 3 for M Key type 2260/2280, 8x SATA 6Gb/s, 8x USB 3.0, 2x USB 3.1, 2x Intel Gigabit LAN, 8-Channel High Definition Audio, 5-Way Optimization by Dual Intelligent Processors 5, ASUS Digital Power Design, FF CEB.
The X99-E WS/USB 3.1 can carry up to four dual-slot graphics. It supports 4-Way NVIDIA® Geforce® SLI™ and AMD CrossFireX™ x 16 Link, making it an excellent choice for graphics professionals who depend on powerful graphics.