I'd be more than happy with a 5.7Ghz Ivy bridge on air wouldn't you? 57x 'limit' is not an issue at all.
16x PCIe 2.0 is not being fully saturated even with a 6990 which is effectively only 8x PCIe 2.0 per GPU. Why would you think PCIe 3.0 would need more memory bandwidth when the GPUs don't even need it??
Quad channel Ram & PCIe 3.0 is not a bad thing but it's just not needed at all for current or even future GPUs and games within the next year or 2. It'll be great for other applications like benching, rendering or folding but excessive for gaming compared to what Ivy bridge can offer.
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