Realtek RTL8111C chipset with Integrated 10/100/1000mb Transceiver. Includes with Both Full and Low/Half Profile/Height brackets. Driver comes Built into Install Disc of Windows and Linux. There is NO DRIVER SUPPORT for FreeBSD nor OpenBSD. Derivative project like FreeNAS will not work with this network card. Might have compatibility issue with some HP and Dell computers, please check with HP or Dell first before buying this card.