Shuttle XPC SN96G5 Barebones nForce3 Ultra Socket 939 @ Hardcoreware.net
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If you're looking to build a Small Form Factor system based around a Socket939 Athlon64 CPU, the brand you will likely look at first is Shuttle. This is because Shuttle not only started the whole 'barebones SFF system' craze, but stuck with it, and revised their platforms over the years.