Wait.. If you're gonna spend 7990 kind of money why not just grab the Titan? Single card with similar performance, low power use bigger frame buffer.. I had two 7970's in Crossfire for a while both massively overclocked. The Titan feels just as fast as a in a league of it's own when it comes to smoothness, minimum fps are higher.. Games feel nicer...
I would seriously consider it, the 7990 is mahoosive, I think it's needs a support arm not to break the PCI-E slot.. Not to mention heat and noise...
You have a point. But the 7990 is still faster and its cheaper.
I dont have to worry about noise or heat or weight as it wikl be watercooled in a prodigy