Note: Dual motherboards do not support CPUs starting with E5-16XX (V1, V2, V3). This is because the CPU cannot form a dual CPU system. Support: a combination of the same model of CPU or a combination of different models the same number of cores. Not supported: Mixed use of different core numbers, for example: 4 cores + 6 cores cannot be mixed, 6 cores + 8 cores cannot be mixed Dual CPU driver, 7+7 phase power supply, dual heat sink. X79 chip, four channel DDR3 memory, all solid state capacitor, dual PCI-E graphics card. Integrated chip sound card/net-work card, main chipset X79, integrated RTL8111H net-work card. CPU platform, CPU socket LGA 2011, supports 2 CPUs at the same time. Memory type DDR3 1866/1600/1333/1066MHz, memory slot 4xDDR3 DIMM. 2x8Pin power suppy interface, 1x24Pin power supply interface. Due to different batches of productions, there might be some difference between the pictures you've seen and the motherboard you , for example, retail boxes, colors of DIMM slots, SATA ports, PCI or PCI-E Slots and other ports, are subject to change without prior notice. Does not affect the use, understand, . Expansion Slot: PCI-E slot 2 x PCI-E X16 graphics slot PCI-E slot 3xPCI-E X2 2x USB3.0 pins 6x USB2.0 pins (3 groups) 2xSATA3.0 interface 4xSATA2.0 interface 1xNVME M.2 interface I/O Interface: PS/2 interface PS/2 keyboard and mouse universal interface 1xRJ45 net-work interface 6xUSB 3.0 interface 2xUSB 2.0 interface AUX port Specifications: Item Type: X79 Dual CPU Motherboard Mainboard Type: ATX Main Chip: X79 series Graphics Card Slot: PCI-E 3.0 16X dual interface Expansion Slot: 7+7 power supply CPU Slot: 7.1 channel CPU Type: LGA2011x2 Memory Slot: DDR3 4 slot 4 channel Memory Capacity: 32Gx4 DDR3 Memory Speed: 1866/1600/1333/1066 SATA Interface: SATA3.0x2 SATA2.0x4 USB Interface: USB3.0x2 USB2.0x12(including expansion) M.2 Interface: PCIE X4 3.0 NVME Note: Random color, 't accept the specified color. size:281x255mm Material: PCB colour: black Package Contents: 1 x Motherboard 2 x E5 2640 CPU 2 x Ram(random color and appearance) 1 x SATA cable (random color and appearance) 1 x Switch cable (random color) 1 x Baffle(random color and appearance) Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the a little different from the real thing. The measurement allowed error is +/- 1-3cm.