Marc Koval replied about the 5.0V vs 5.2V question.

Apparently, the adjustment to 5.2V is only possible with the XP power supply. If you have a UMEC power supply - as most M processors older than 2 1/2 years - there is no adjustment.

Jerome
Music: NUC + ROCK + QObuz > MS600 > G65 > DSP8000SE + DSP5200HC.SL + DSP5200SE rears
Movies: Apple TV > HD621 > G65 > DSP8000SE + DSP5200HC.SL + DSP5200SE rears