Asus Motherboard X99-WS/IPMI (Retail) Chipset: Intel X99 Memory: 8x DDR4-3200(OC)/3000(OC)/2800(OC)/2666(OC)/2400(OC)/2133 DIMM Slots,Quad-Channel, Non-ECC, Unbuffered,Max Capacity up to 128GB Multi-Graphics: Supports AMD Quad-GPU CrossFireX and NVIDIA 3- Way SLI Technology. Operation temperature: 10C to 35C Ports: 8x USB 3.0/2.0 Ports (4 rear, 4 at mid-board), 6x USB 2.0/1.1 Ports (2 rear, 4 at mid-board), 1x Optical S/PDIF Out, 1x Management LAN Port, 2x RJ45 LAN Ports, Audio I/O Jacks