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: MotherboardModel: X99Sound Card: Chipset integrated chip sound cardMotherboard Chip: For Intel X99Gigabit Network Card: Integrated RTL8111H Gigabit network cardChip: Audio integrated 6-channel sound chipCPU Socket: LGA 2011-3Memory Size Memory Type: DDR4 3000/2666/2400 / 2133MHzMemory Slot: 8 × DDR4 DIMMExpansion Slot: PCI-E slot 2 × PCI-E X16PCI-E slot 2 x PCI-E X12 x USB3.0 connectors (1 set)2 x USB2.0 connection pin (1 set)8 x SATA3.0 interface2 x NVME M.2 interfaceI / O PS / 2 keyboard or universal interface1 × RJ45 network interface (Gigabit network card)4 x USB 2.0 port4 x USB 3.0 portBattery 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 CableNote: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