It would be quite the feat to find a case to contain the system below, with four HD7970s powered by two 1200W PSUs plus other assorted components, not to mention the heat this system will produce.  Not even the ASUS MARS 2 in SLI can keep up with this monstrosity and the scaling from a pair of HD7970s is rather impressive as in the past adding the third and fourth card did not lead to large gains.  The Core i7-3960X @ 4.8GHz simply can’t keep up with the GPUs, implying that this system could actually be more impressive.  If you want to see $2200+ of GPUs in action then head to OC3D.

"In combination with ASUS we’re rerunning our Quadfire HD7970 test with the benefit of overclocking. Roll up, roll up."

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Graphics Cards