Mine can shutdown at 80c but it depends if it spikes to that or if it gradually gets there. I found that using Thermal Grizzly Kryonaut, I was spiking quickly to 80-86c in testing. The CPU was reading ~15-20c higher in general. I switched back to my old ThermalTake TG-7 paste and temps were back to sanity levels. I use a Corsair H110i GTX AIO and my temps stay around the 79-80c range in CB23 multi running PBO +100. I have a 5600X but he concept is the same.
I think you need to stop using Ryzen Master, it's total garbage and go back to old fashioned BIOS. Set you SOC to around 1.15v for any RAM or FCLK under 3800/1900 respectively. If you run higher like I run 3933/1966, you need the full 1.2v SOC and some higher other voltages like CCD, VDDP, IOD all at around the 1.05-1.07 range.
Sounds like you're pretty stock though and that type of testing, you'll want a better cooler to hit higher numbers. You can try enabling PBO and +100 for starters with the SOC manually set to 1.15 and see how that works. If it crashes, you'll need to back the +100 to say +75, then +50, if it fails to do +50, leave that extra boost off and use regular PBO and the Auto OC alone.
Your scores now aren't too far off from that article anyway. A few hundred points or even a thousand is no cause for alarm especially when the guy's that run those tests are professionals with better cooling and most likely a better binned CPU. The short answer is ,no your CPU is NOT defective. Your setup is not totally correct, but it's not off enough to even complain.
If the CPU is boosting at all to 4700 or more it will do so only on a few cores at a time, not all. When you run CB23 in multi-core, you're putting the CPU into an all core load and it will accordingly add voltage/reduce clock speed to keep you under the 95c max and to keep you stable. So seeing a peak of 4.1-4.5 on all cores maybe less depending on how quickly it senses the temp increasing, is totally normal. CPU-Z is the best, short term test for a stress test of just to see how the boost is working or not when using weak cooling or stock air cooling. See my example screen. My CB23 peaks all cores at 4500 or so but it goes to 4750-4790 gaming or doing other lighter threaded apps. CB23 is an all core, heavy threaded load.
