A quick fix is to just open a side panel. That should help dropping the temps by few C(s). Also ambient temps are high now so if you have AC crank it up
. I put my comp on top of the AC vent that makes my 7970 CF very happy with temps below 65C at full load.
Long term fix is to get full size tower or 140 or 120mm fans blowing air in from bottom and fans on the back flowing hot air out.