Caporegime
But that's still nothing compare to the amount of heat of pair of cards in CF or SLI.
Most sensible people would have fan(s) on the side-panel of the case for removing the heat from the lower half of the case anyway (this is one reason despite lots of Corsair windowed cases look very good, they are not great for GPU cooling).
90º mobo mounting FTW!
All that hot air just naturally rises out my Raven2, helped along by 3 140mm fans blowing upwards.