 Integrated Intel High Definition Audio (HD Audio) supports up to four hardware audio codecs and multi-channel audio streams.An Intel Gigabit Ethernet controller is also integrated, supporting (among other features) receive-side scaling (RSS) with two hardware receive queues.Some of the connectivity options and interfaces provided by the X99 chipset are configurable via Flexible I/O, which allows certain hardware capacities of the chipset to be selectively distributed between the PCI Express, USB 3.0 and SATA interfaces.