Fits three 3.5' SATA I / II / III (SATA 6Gbps) hard drives in two external 5.25' bay. & fully supports SATA Hot-Swap function. 80mm cooling fan with full metal body for excellent heat dissipation for the most intense applications. Supports SATA 3.0 up to 6Gbps / SAS 3.0 up to 12Gbps Large 92mm cooling fan with full metal body for excellent heat dissipation for the most intense applications. Uses SATA 15 power ports for best compatibility with the newest power supplies