Astrotek IEEE1394a (Firewire400) PCI-Express x1 Card, 2 x IEEE 1394a Ports, 1 x IEEE 1394a Shared Port, Max. 400 Mb/s transfer rate per port, PCI Express Base specification rev.1.1 compliant, IEEE 1394a Open HCI specification v1.1 compliant, IEEE 1394a-2000 Physical Layer Services compliant, Built-in FIFOs for isochronous transmit (2048 bytes), asynchronous transmit (2048 bytes), & receive (3072 bytes), ACPI & PCI Bus Power Management 1.1 compliant, Support power states D0, D1, D2, D3hot, & D3cold, 32-bit DMA channels for physical memory read/write, 32-bit CRC generation & checking for receive/transmit packets, 4 isochronous transmit DMAs & 4 isochronous receive DMAs support, Support Hot Plug, No Drivers need for Windows 98SE or above, with standard-height and low-profile brackets.