I don't fully agree with that. To me it looks like (and this is also mentioned in some places other than reddit) that there are conflicts between BIOS, Ryzen Master, and maybe some other thing (power plans?).
Also, if I change the same value in one place (Extreme Tweaker > X) and in another place (Advanced > X), then it works fine in one case, and the PC doesn't boot in the other case. Something is definitely wrong here. The specific value that behaves like this for me is Precision Boost Overdrive set to Enabled.
So if I adjust some values, the system is stable, I am getting faster rendering, lower temperatures, and less noisy fans - then why shouldn't I be doing this, and why isn't it working like this out of the box?
Hm, I too managed to get more suitable performance by abandoning stock settings (3960x).. I didn't really find out what stock voltages are, but they fluctuate somewhere between 1.08 and 1.4 for turbo I guess?
So I disabled auto-OC and PBO and set stable 4000mhz on all cores with 1.112V, and I am getting very stable performance with 5-10 degree less than stock - running Corona,
without any noticeable performance loss on multithreaded (+- same corona benchmark), but I haven't really tested single-thread though as it's not my primary target I guess..
I would probably be able to run 4200 all cores with same temperature outcome as stock, but with performance gain of about 5% on CB.. but I prefer to keep things cooler as that gain is not that great..
So here is a small quick test from this morning:
(same fan settings, same scenes)
Stock: C R15 - 5950sc - 70c (200-210 single core)
CB - 37sec - 69c
AIDA64 stress test - 84c
Corona test scene - 76c / 85c denoise
PPT - 90% of 280W (measured on ryzen master)
4000mhz all cores(no PBO)C R15 - 5900sc - 62c (190-195 single core)
CB - 38sec - 60c
AIDA64 stress test - 70c
Corona test scene - 63c/ 72c denoise
PPT - 60% of 280W
So, what are your thoughts? If I had more time to tinker with voltage/freq a bit more I guess I would be able to run it even faster with lower power consumption and temperatures,
but also at these values I probably prefer the later option, as the power/temperature output is much higher than very very slight performance loss..