SFF8643-P304 is a Mini-SAS HD (SFF-8643) to PCIe x16 Slot Board, which provides one PCIe x16 in connection to the PCIe switch host card. It can expand one PCIe Slots by plugging into the PCIe Host Adapters with 1 SFF-8643 connectors. All the network cards, graphic cards and video cards are supported for the PCIe slots. With standard 4 Pin /15 Pin power socket for stable expansion and output. It can flexibly built in all kinds of PCIe Devices, Servers and Terminal Extension Devices.   Technical Specifications  Primary PCIe Connector: One Mini-SAS HD 4i Receptacle Connectors (SFF-8643)  Secondary PCIe Connector: PCIe x16 slots Supports 4-lane PCI Express bandwidth  Power connector: One SATA 4 Pin / 15pin power connector for 12V & 3.3V