ive taco'd a few, toasted a few, hell im toasty right now!
in all seriousness though ive been able to push 4 titans on one board up to 250-270 range and keep it stable,
it took a lot of firmware hacking and liquid cooling, but it's totally possible!
And if people blow them up I can fix them :-) But really might be a better investment (not for me of course) to run them a bit cooler since these actually seem to have value over time. Which is kind of amazing.
Even when I was GPU mining, I found that undervolting and running a bit slower/cooler was always a better option than hitting everything on head as hard as I could. I'm not surprised that the Titans also run better this way.
When I first got my Titan, it was totally unstable, but I wound up running it a little slower and it was better that way. I should have taken the hint. With everything that's transpired since then, it makes perfect sense.