2 IDE port allows to connect up to 4 IDE devices. Stable and reliable chip VIA VT6410 chipset. PCI specification revision 2.1 compliant with 33Hz & 32-bit data. UDMA6 ATA/133 specification compliant. Backwards compatible with Ultra ATA/100,Ultra ATA/66.Ultra ATA/33, EIDE/Fast ATA. Two internal IDE/ATA ports. Supports two IDE channels, connect up to four IDE/ATA devices. Data transfer rate up to 133MB/sec per IDE channel. Large LBA support for drives above 137GB. Supports PCI IRQ sharing to save valuable resources for other I/O expansion cards. Supports PCI plug and play. Operating System: Windows 98/SE, 2000, 2003, NT4.0, XP, Vista. Package content: 1X Brand New 2 Port IDE PCI Expansion Card. 1X CD Driver.