Add two PCI-Express 3.0 x16 capable cards and increase the potential of a Thunderbolt 3 or 4 capable laptop, desktop, or all-in-one system. This Thunderbolt 3 PCIe Expansion Chassis lets you take advantage of the vast range of PCIe expansion cards with computers that lack PCIe slots. The chassis lets you connect an external monitor via the DisplayPort (DP) or Thunderbolt 3 ports, supporting Ultra High Definition (UHD) 4K or 8K resolutions.