One major downside of current motherboards based on AMD's 790FX chispet is the SB600 south bridge, which is getting long in the tooth and suffers from lackluster PCI and SATA performance. We've been expecting 790FX motherboard based on a new south bridge since the 790FX launch, and the folks at Fudzilla have nabbed a picture and some specifications for a 790FX mobo with an "SB750" south bridge.
This "Hawkfish" motherboard is a reference AMD design, Fudzilla says, and it features four PCI Express x16 slots, one PCIe x4 slot, only a single PCI slot, six 300MB/s Serial ATA ports, one IDE port, and a "4+1" pulse width modulation design. The six SATA ports can handle RAID levels 0, 1, 5, and 10, as well. On the cooling front, the north bridge chip is actively cooled with a small fan, although retail offerings may end up different—after all, original reference 790FX designs had the same cooler.
In an older report, the same site claims the SB750 south bridge will have an "OverDrive 3.0" feature that will somehow aid overclocking in Phenom CPUs. The report explains, "AMD demoed a board with the SB750, which struggled to overlock the CPU to 3GHz, but once the overclocking feature was enabled the same CPU had no problem reaching 3.2GHz."