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I use the Artic Cooling Freezer 13Pro on the 8120. It's on a linux box (@100% on all cores) but I think CPU temperatures are being reported incorectly as they peak at around 40C at stock speeds. You need a large case for it though

I use my mainboard utillity for core temp. AMDs utillity is not callibrated correctly on my system.

The 8150 auto throttles Ghz at 75C to avoid blue screen/crash.  But if your not monitoring, it will be unnoticed.

The problem I've experienced is that it takes over 10 mins to reach that state, with no aparent indication or stabillity issues.

The only way to spot it is by monitoring CPU parameters at full load and look for auto throttle.

My 8120 diesn't throttle back even if you run it over a full day, you can tell as the sample rate returned by the slave doesn't change. Spped wise it is returns around 120kS/s when the X4 965 is at 100kS/s on the same scene.

Also got the 8350 and replaced the 8120 with the 8350 and it was returning samples at around 205kS/s. Again no cooling or slowdown issues with the 13Pro over 4 hours.

CPU load was showing 100% on all cores.