Hey wez...
Our chips seem to have come from the same batch (maybe even the same wafer ). Mine is a 1237 PGN, Serial #0126.

I've been pushing the limits of stability quite a bit.
Although it seems daily stable @ 4.95/1.50v (a # of different stress tests), I've since had a few quirks when encoding some HD video...

Even though temps are in check my chip gets a little squirley whenever my Vcore is >1.485 (ambient water).
I assume it's electron-migration... Just wondered if you've noticed the same thing with your chip?
I've rolled my OC back to 4.83/1.48125 and the encoding stability problems seem to have went away...

Don't get me wrong!
I can push it up to 5.3+ Ghz with voltages >1.525 and pass a lot of benchmarks, but real stability fades ~1.485v.
Maybe I just didn't get the best sample... Wouldn't be the first time...