Main stream CPUs usually have a desired overclock that gets tossed around the forums, as I remember around 3.6 Kentfield’s, 4.0 Wolfdale’s not up on newer hardware. More was better but the goals where usually attainable with a little extra money spent on a good air cooler and a few extra fans, so efficiency benching might work.
Stress test benching, like the idea but variable freq – set duration don’t see any difference than what is already done here. Set freq – variable duration might work, once and on the edge freq was known for specific cooling type but use a benchable ambient freq with a SS and you might need an achievement like, I used enough electricity to power Amazon.com for a week.