Foxconn provides two x16 PCI Express slots and two x1 expansion slots.
The Northbridge cooling is pretty significant and should keep temperatures pretty low even under high loads.
Foxconn has a lot of confidence in its voltage regulators, because it only uses three phases. If you use a processor that draws 100+ watts, each phase has to cope with over 35 W!
This additional PCI Express SATA controller (Silicon Image SiL3132CNV) adds two more SATA ports and supports NCQ.
The 975X7AA features two Gigabit Ethernet controllers by Marvell.