When the tech excites me or if my current platform if annoying me. Basically, I don’t try to logic it, I just use my machine until I decide I both want and can afford to build anew.
I think trying to time it or play the measuring game is a fools errand unless you’re using it as a workstation or something.
This feature is a lot like DLSS1; was cool to follow and for some of us early adopters to trial, but not something anyone should be basing any serious discussion/evaluation on