Underclock/-volt to counter board instability with 100w APU?

kn1012

Honorable
Jan 31, 2013
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My board (Asrock FM2A78M-HD+ CPU list) seems to have been built with 65w line of FM2 processors in mind-- all on board's support list are 65w, and tech support says 100w apu caused instability. I'm looking to get a 100w A10-5800 -- it's the best graphics and CPU within my price range. Would it be possible for me to underclock and undervolt the 3.8GHz to achieve lower wattage, and maybe counter instability caused? Would that, if even possible/feasible, handicap the IGP?

What.. again assuming any of this makes sense.. would be the lowest wattage I could expect to tune the APU down to?

I guess equally important- what would *cause* a power increase to cause instability? Is it as simple as that, or does the increase just reflect a different manner of operation, less compatible with boards made to handle the less power-intensive series??