ECS puts up a good fight with the higher end chipset 790FX in the single card comparison. In terms of performance, we don't see much differences if you intend to use a single graphics card on it.
The board comes with 3 PCI, 1 PCIe x16 and 2 PCIe x1 slots. Right behind the PCI slots are the audio codec, GbE controller chip and a Jmicron supporting the eSATA at the back panel. To the right is the 4 pin power connector and we see a 3 phase power being implemented.
At the centre of the board is the North bridge AMD 770 passively cooled and South bridge SB600 on the left bottom corner of the board. On the left are the external USB bracket connectors, below it is the 4 SATAII ports with I/O controller chipset next to it. 4 DIMM slots are sighted in the far right with a PATA right below.
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http://www.ocworkbench.com/2007/ecs/a770m-a/g1.htm