Bottom line is this...and I'm pretty sure I said this before too...

If stability is mission critical to you (a) you should not overclock and (b) you should not be buying off-the-shelf desktop chips

MRI Tech to Systems: "Hey, what are you guys doing here?"
Systems: "Dude, we totally overclocked your MRI scanner and it's 2x faster now! No need to thank us "

You'd never see that...