Ryzen also uses clock stretching where single(?) clock cycles can be lengthened on demand (power transients), which allows running stable at otherwise marginal

Ryzen also uses clock stretching where single(?) clock cycles can be lengthened on demand (power transients), which allows running stable at otherwise marginal clock speeds. I suspect that that is part of the reason why Ryzens have so little overclocking headroom - there are tiny safety margins in their clock frequency.