Boost a Thunderbolt 3 laptops performance with support for up to 3 slot-wide PCIe desktop graphics cards: Graphics card sold separately Transforms Thunderbolt 3 laptops into a desktop-class system with 4X USB ports, Gigabit Ethernet and Razer Chroma lighting Macs require mac OS High Sierra 10.13.4 or later and compatible AMD graphics card. Inner Dimensions: 33 L x 5.7 W x 16 H Cm Windows 10 systems require external graphics (eGFX) support with RS4 or later and compatible NVIDIA or AMD graphics card Powerful 700 W ATX power supply and 100 W laptop charging, GPU maximum power support: 500 W