Asus gene IV 2011

Only if you can find single-slot GTX680s, which I have not seen. The PCIe spacing is such that you can't fit 3 of any dual-slot GPUs.
 
Not sure why the last won't be connected...

And yes, 3 7970s should work as long as you get the single slot brackets. The 680s definitely will not work due to having one DVI port on the second bracket, and the double stacked PCI-E power design.
 
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