Nah it is not for benching. I use this PC for gaming. With my current 4.2 all core on 1.2V, I sit at max 50°C playing games.Ryzen Master does not guarantee safety, that program is perenially buggy as shit. Not even PBO is always, 100% safe long term, ie. the Zen 2 EDC trick.
If you're set on doing all-core, just try to stay below say 1.25V and keep thermals under control. Ryzen degrades primarily with current (ie. power), so don't be benching all-core 24/7. Higher temps and/or higher volts accelerate that process.
Only bench I ever do is a couple cinebench runs when I set a new OC profile to test it, and that forces the CPU way harder than any game I play.