Key Benefits • Professional eSATA interface delivers faster performance than standard eSATA, FireWire 800, FireWire 400, and USB 2.0—transfer files to and from your drives in less time • FIS-based port multiplier-aware, and works with enclosures with hardware RAID controllers—supports up to 20 disk drives • Native PCI Express (PCIe) x4 host bus interface for high-performance applications • Supports Mac OS® X, Windows 7 (Professional or Ultimate), Windows Vista (Enterprise or Ultimate), Windows XP Pro, Windows Server 2008 R2, Windows Server 2008, and Windows Server 2003 RAID features • Supports Sonnet-exclusive locking eSATA data cables • Supports hard drive hot-swapping • SATA II compliant, 3 Gb/s and 1.5 Gb/s drive interface auto-negotiation • Spread Spectrum Clocking (SSC) support for compatibility with all SATA drives Pure Performance. Pure Satasfaction! When it comes to data storage capabilities, which do you prefer, raw storage capacity or scorching performance? With Sonnet's Tempo™ SATA E4P, you get the best of both worlds! This card offer unprecedented scalability through its support of port multipliers—it can handle up to twenty drives! Used with high-performance drive enclosures like Sonnet's Fusion™ D500P, port multipliers manage the data flow of up to five drives in one enclosure through a single cable. Using today's highest-capacity drives, you can connect an astounding 40 Terabytes (40,000 Gigabytes!) of storage! Mac & PC Compatibility For complete Mac and PC compatibility list, visit product's webpage.