As the name suggests they are based on AMD's 790FX, 790X, and 770 chipsets, respectively. All three boards feature AM3 sockets and DDR3 memory slots, as well as an 8+2 CPU VRM power phase design that allows maximum overclockability and compatibility with 140W Phenom II processors. Just like their Intel counterparts, these rely on NEC's uPD720200 chip for USB 3.0, and Marvell's 88SE9128 controller for 6Gbps SATA.
No detailed specifications are available for the 790X and 770 models, but according slides posted by The Tech Report, the enthusiast-grade GA-790FXTA-UD5 has three PCI Express x16 slots (capable of running in a x16, x8, x8 lane configuration), eight internal SATA ports, two eSATA/USB combo connectors, and Gigabyte's Precision OV to ensure precise voltage control and fine stepping for the CPU, memory and chipset.
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