You'd be surprised at how much air those 3 fans can move. Their not your regular desktop 120mm's... these are meant for the datacenter where the 40mm screamers make anything seem quiet.
And I ran an SMP client with 8x GPU clients simultaneously and none of the temperatures were out of anything expected even in a well-cooled desktop computer. This system was designed exactly for this.
As for asking me to prove this... the system has been shipped now.
Some lucky bastard at some research group somewhere is going to have all the fun now.