The Sabertooth X79 uses an ASUS-designed Digi+ VRM to power the CPU, which is spread across two sides of the socket (north and west). The heatsink cooling the VRM components to the west is actively cooled by a 40 mm fan, the one over the X79 PCH is cooled by a similarly sized lateral blower, too. Like with the other two top-tier boards from ASUS' stable, this one provides eight DDR3 DIMM slots supporting quad-channel memory.
Expansion slots include two PCI-Express 3.0 x16 wired to the processor, one PCI-Express 2.0 x16 (electrical x8), and two PCI-Express 2.0 x1, wired to the PCH. There are eight internal SATA ports, including two SATA 6 Gb/s (brown) from the PCH, four SATA 3 Gb/s (black) also from the PCH, and two SATA 6 Gb/s (white) from a third-party controller. There are two eSATA ports on the rear-panel, one of which is power-eSATA.
Other connectivity includes 8+2 channel HD audio, one gigabit Ethernet connection, four USB 3.0 ports on the rear panel, two USB 3.0 ports by internal header, USB 2.0, and Firewire.