1、for Thunderbolt GPU Dock: For intel(R)JHL7440 for thunderbolt device chip is used to break through the 22Gbps limit of JHL6 series and the castration of JHL8 series PCIE X1. It can achieve 32Gbps data transmission of PCIE3.0X4. It can be achieved using for thunderbolt 3 or for thunderbolt 4 data line. 2、Function: For Thunderbolt compatible GPU dock. If your laptop has for Thunderbolt 3 or for Thunderbolt4 compatible interface, you can use it to connect external graphics cards to improve game performance. 3、Easy Installation: Equipped with SFX and ATX mounts for easy installation of graphics card, power and docking. 4、Support Daisy Chain: Dual for Thunderbolt compatible ports support daisy chain for excellent performance. 5、Power Supply: Support ATX, SFX, for FLEX and other power supplies. Support PD charging (up to 60W). Item Type: For Thunderbolt GPU Dock Material: Aluminum Alloy Model: TH3P4G3 Product Size: Approx. 166 x 91 x 28mm / 6.5 x 3.6 x 1.1in Port: For Thunderbolt 3/4 Transmission Rate: 40Gbps USB3.0: 5Gbps Daisy Chain: Supported Power Supply: ATX, SFX, for FLEX, Other Supported Graphics Card Sizes: Unlimited Pd Charging: Maximum 20V 3A 60W Usb Functions: Usb: 5V 2A Type c: 5V3A 1 x For Thunderbolt GPU Dock1 x ATX Bracket 1 x SFX Bracket 1 x Data Line 2 x Screw 2 x Plastic Block 1 x Screwdriver 1 x User Manual