This is the 1090T rig in my sig, undervolted (if you notice the PC placement, it's the only place I had and it exhausts the air into the corner...just to keep it from overheating due to hot air recycling [even undervolted] I had to buy that little fan from Wal-Mart to move the hot air out) and overclocked to 3.4GHz. It's my school computer, so the only time it is strictly folding is 5-6 hours a day maximum.
I'm hoping to part/sell my "home" computer and use that money to buy a 2600K setup strictly for folding.
I'm also thinking about different case/case placement options for this rig so I'll be able to properly overclock. Sure, I'm 200MHz faster than stock, but I'm also undervolted to keep temps in check. I'd love to be able to get to 4GHz, but until I can get this heat problem solved...I can't give it any more voltage.