Only two ports can work at same time. You need to set the jumper at the PCB. Speed for SATA III up to 6.0Gbps, compatible with SATA I and SATA II. PCI Express speed rate to 2.5G/S, double channels. Support IDC/AHCI Model,Hot-plug capability,Native Command Queuing (NCQ),PCI Express x1, x2, x4, x8, and x16 Lane. Support for Windows , Linux and for Mac OS X 10.6 and above (Note:It is not support windows 7 and windows 8)