Features: SFF 8639 to PCIE X4 adapter card, designed for seamless compatibility with NVME SSDs. This adapter card is made from durable metal material with a heat-dissipating design for excellent thermal conductivity, ensuring stable and reliable performance even in extreme temperatures. PCIE interface is compatible with motherboards featuring X4/X8/X16 slots; Thick gold-plated electrical contacts are in close proximity to the motherboard interface, reducing disk usage errors and working smoothly; SFF-8639 to PCIE X4 expansion card PCIE X4 to .2 riser card SFF 8639 PCIE GEN3 SSD converter; Specifications: Material: Metal Size: Approximately 12x12x8.5 cm/4.72x4.72x3.35 in SFF-8639 to PCIE X4 Supports NVME SSD; Compatible with motherboards featuring X4/X8/X16 slots Note: Allow 1-2 cm tolerance due to manual measurement, make sure you don't have any objections before ordering. Due to differences between screens, the color in the image may slightly differ from the actual product. Packaging content: 1x SFF-8639 to PCIE X4 adapter