Gee, I can't see why you guys are having any thermal issues at stock clock speeds. My 3 have been running continuously at 2.4T in the quite warm (90F+) mining area of my basement. With 1 fan, though the handles are pointing outwards. I hate to mention this, I'm only trying to help, but you guys are peeling the plastic from both sides of the thermal pads before use??? 

I had to ask since my three have been amazingly reliable and robust so far...
The air coming out the center is as hot as a BIG blow dryer, and the chips are too hot to touch, so I'm wondering about longevity, but as long as they hash for six months I'm fine.