Yes of course I understand that overclocking is do-at-your-own-risk, no problem with that.

But the fact is that I did not change anything between my configuration for PR 1.2 and my configuration for PR 1.3, except updating Opptimizer to the correct version. I have Smartreflex VDD1 and VDD2 activated, and no custom voltage.

I run 1.2.7 version with kernel 1.5.4. In PR 1.2 I was running at 1150 or 1200 MHz, and successfully passed the iterations step at 1300 (but decided not to use it). Now, in PR 1.3 with the updated Opptimizer, even 1250 makes the N9 to reboot during the iterations, and 1150 is highly unstable. I don't know if it comes from my device or other stuff I may have screwed up in config files (or by installing stuff like Faster N9), or if somebody else experiences the same issues since the update. Hence the question!