Side mount one of these and water cool the cards:
http://www.frozencpu.com/products/11760/ex-rad-123/Phobya_XTREME_Nova_1080_Radiator.htmlI guarantee you that 4 high performance cards in that case will run hot and noisy.
Notably I didn't see them mention what motherboard they are using. If it doesn't support SLI then it's not much use to gamers anyway.
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