NewerTech MAXPower eSATA 6G Pro PCIe 2.0 Controller Card, Up to 500MB/s Data Transfer Rate Driverless install and no future driver updates/maintenance needed. Adds two 6Gb/s eSATA ports for the fastest Mac Pro data interface available. Works with ANY eSATA interfaced equipped external hard drive or optical drive. Card does not support port multiplier cases/enclosures. Backward compatible with SATA Revision 1.x (1.5Gb/s) and 2.x (3Gb/s) hard drives and solid state drives. Uses the same connecting cables utilized by earlier SATA 1.5Gb/s and 3Gb/s devices. Plug and Play ready with industry standard AHCI compliance. Compatible with eSATA port equipped external storage solutions and optical drives.