ASUS X99-WS-ASUS-IPMI-0803 Genuine 4-way x16 graphic power Quad Strength Graphic Power – 4-Way PCI-E Gen3 x16 link supporting NVidia GeForce SLI and AMD CrossFireX on demand Supreme Power Solution – Premium components deliver industry-leading power efficiency 5-Way Optimization by Dual Intelligent Processors 5 – One click, total system optimization Superb storage flexibility– onboard M.2 x4 and support for both ASUS PIKE II and ThunderboltEX II cards Easy maintenance–ASUS Q-Code Logger, an easy-maintenance button and Dr. Power LED displays unusual power statuses