I don't disagree with anything you said. I think it is ridiculous that AMD and Intel both officially will not warranty a processor that you admit to using PBO or Intels XMP. By Federal law this is actually arguably Illegal by the Magnuson-Moss warranty act. However you would have to pursue litigation which would likely dwarf the price of replacement to get anything done. It surprises me that class-action suit in this arena has not happened yet.
But until then they set their own rules, then advertise these as normal features and promote the use then hold it against you if you do.
That being said you don't have to mention you ever did it and they have no way of knowing that you did. As usual in this world only the honest get punished.
Now from their point of view is that even if you are not OC'ing the processor even using the the PBO to increase the memory speed to it's supported speed increases the infinity fabric speed for instance, they see that as a sort of overclock. Even though it supports up to 1900.
I don't get it either. Gamers Nexus just did a video on this very topic with Intel processors this week.
In answer to your specific issue is that PBO is going to run your memory faster and that may be where you instability is. Not saying it is, you need to test that. It may run fine at the lower speed but not at its max speed. You could pull one stick at a time and see if it runs with stability with one versus the other.
If that makes no difference I would likely pursue a processor RMA just let your conscience be your guide as to whether you say you did or didn't use PBO.
