It's a Ryzen, not an intel. It doesn't work the same, voltages are applied and used differently. By trying to force a Ryzen to behave like an intel you cripple it, and that generally applies to OC.
Intels are for the most part non self governing. The more you give it, the faster it goes and that works great as long as you can keep the temps under throttle temps. A Ryzen is highly self governing. It'll give you the best it can without allowing you to hurt it. Ryzens are efficiency engines, the more efficient you make it, the more it can give.
Lowering voltages will lower temps, which allows the Ryzen to boost higher, for longer. So whereas an intel will chop the power limits (PL2 down to PL1 at Tau) a Ryzen just keeps chugging away.
An example would be my 3700x, I get higher cinebench and higher fps at 4.29GHz all core and 62°C than I do at 4.4GHz all core and 84°C. And that's without any PBO, because my cpu maxed out is under the power limit, so has no need for PBO to raise them. It literally 'thinks' faster, regardless of clock speeds, because the temp is lower, but there's enough voltage to allow it to behave as it requires.
Chopping voltages to absolute minimum required for stability in order to lower temps, is Intel OC. Using a large enough Efficient cooler to moderate temps, coupled with an offset/vid drop in demanded voltage to minimum working voltage is Ryzen OC.