Features: This product is SFF-8611 8i (also known as SFF-8612) to PCIe x16 interfaces, but in reality, it can only connect to PCIeX8, which is PCIeX8 in PCIe x16 This product supports PCIe 4.0 and is compatible both PCIe3.0 and PCIe2.0 product. This product uses a universal signal definition for the SFF-8611 interfaces PIN pin signal. If your machine's SFF-8611 interfaces PIN pin signal is defined as a special design, then this product is not compatible. This product needs to be connected to the 24PIN power interfaces of the chassis power supply. TheS1 switching on the adapter card is the chassis power starts switching. In principle, theS1 switching should be turned to the OFF position. When your computer starts, the external power supply should also start. If the external power supply cannot start when your computer starts, please turn theS1 switching to the ON position. Please resolve any technical issue related to the installation of driver for external graphics cards or other devices on your own. Our store is unable to provide technical support; This type of adapter card conversion does not need to be achieved through chips, and product without chips are equivalent to cable and do not require any driver. Specifications: Size：Mixed Item: SFF-8611 8i（SFF-8612） to PCIE x16 Adapter Card Supports PCIe 4.0 and Compatible PCIe3.0 PCIe 2.0 Package Includes: 1PC SFF-8612 to PCIE4.0 Adapter Card note: Due to the problems of lighting effects and shootingangles, there will be certain tolerances in the product, please understand. Please allow 0-1cm dimension difference due to different manual measurement.