For anyone else with a super micro 846 chassis, the case fans are not enough to cool the Tesla P4 in the x16 slot. I put the blower fan that they shipped me with the card onto the card and it cooled right off. I was getting thermal throttling in a 55 degree F environment with just case fans. Would probably work better without fan in a 2U case...
I cannot hear the blower fan on the P4 at all over the standard supermicro case fans, so that's nice.