I improved cooling, to get GPU temperatures down from 95 C degrees. I cut the hole into side panel, just opposite to GPU-s and installed 2 pcs of 120 mm fans pulling hot air from GPU-s OUT from the case.GTX 280 pumped hot cooling air out from the case througt back panel, GTX 295 (used in my rig) pumps hot air back to the case.
Temperatures drop immedeatly 7-8 C degrees. Hope, that < 90 C is good cruising temp.
My rig is doing in average 35-36 000 PPD, depending of work units. It pulls ca 800-850 Watts from the wall and most is used by GPU-s, producing lot of hot air.