Feature: 1. With rear 4 USB3.0, mainboard's gigabit network card keeps high‑speed stable connection. 2. Supports four generations of DDR4, mainboard is with eight memory slots, supports ordinary memory and ECC server memory. 3. And NVME PCIE X4 channel m.2 high‑speed hard disk theoretical bandwidth can be up to 4GB / S. 4. Desktop motherboard installation is simple, which does not require particularly complicated operations. 5. After many inspections before leaving the factory, motherboard's quality is guaranteed, you can use it with confidence. Specification: Item Type: Motherboard Model: X99 Sound Card: Chipset integrated chip sound card Motherboard Chip: For Intel X99 Gigabit Network Card: Integrated RTL8111H Gigabit network card Chip: Audio integrated 6-channel sound chip CPU Socket: LGA 2011-3 Memory Size Memory Type: DDR4 3000/2666/2400 / 2133MHz Memory Slot: 8 × DDR4 DIMM Expansion Slot: PCI-E slot 2 × PCI-E X16 PCI-E slot 2 x PCI-E X1 2 x USB3.0 connectors (1 set) 2 x USB2.0 connection pin (1 set) 8 x SATA3.0 interface 2 x NVME M.2 interface I / O PS / 2 keyboard or universal interface 1 × RJ45 network interface (Gigabit network card) 4 x USB 2.0 port 4 x USB 3.0 port Battery Model: CR2032 (not included) Motherboard Size: Approx. 281 x 295mm / 11.06 x 11.61in . Package List: 1 x Motherboard1 x Iron plate1 x PIN Cable Note: The battery needs to be installed for the motherboard to work.The product is a server motherboard, does not support ordinary memory, memory frequency should also be consistent with the system description, and the power supply line of the two cpus should be connected, and the CPU model should be exactly the same to be able to use normally. Simple installation instructions and precautions, several reasons for the problem:1. The mainboard needs to connect two 4+4 CPU power supply ports. Do not use the 6+ 2 power supply of the graphics card as the 4+4 CPU power supply, so that the mainboard cannot work properlyWork;2. the memory slot has orange and black slots, if simply installed on the black slot is not normal display,3. you are not shipped with batteries, it is best to install the battery after the test