Yeah, I've thought of reseting the heatsink but find that to be a high stress process for me.
Ya I hear ya. Probably only after doing it 5 to 10 times did I start to not dread that process and actually look forward to it...
I'm happy with my "mainly" 70sC temps @4Ghz and 0.0125 voltage offset, CPUZ Bench_78C/26C_ambient.
Tried a 0.0250v offset and CPUZ hits the 90sC...Not having that!
Kryonaut paste and three 3000 RPM Noctua fans.(They start ramping up @73C).
A great rule of thumb that is founded in scientific principles that I like to use is that you can get a feel for the effectiveness of a given heatsinking setup: that is to say, a measure of its ability to cool: is to try to get a good real-time read on core temperature, and then watch the temp drop behavior after you stop the load on the CPU. If you have a solid connection to the heatsink that temperature should drop like a rock and then slow down and converge toward the idle temperature. It'll more or less follow an exponential curve. So, open up task manager so u can watch the overall CPU load number, you can even break out your stopwatch and see what the core temp under load is, stop the stress test load as you start the stopwatch, and then look at how far that temperature drops at the 5 second mark. If you have a large cooler, like you do, and if you're getting like you're reporting 78 degrees C, if it is indeed making good contact it should drop very quickly, on the order of at least 20 degrees C into the 50's, after a very short amount of time. If the temperature drop is sluggish, that indicates maybe it could benefit from a redo.
Similarly, (and probably a lot easier, tbh) is look at idle temps, try to get a sample of idle temps reported by other users, etc. usually if you have good case airflow it should be 40 C or below... also idle temps should correspond well between different chips since they'll be sipping power at idle. UNLESS, you have an all core OC that is constant and you've switched off dynamic clocking. Which is, I mean some people like to do that. Actually I have done that with my 8700K, it's pegged at 5Ghz 24/7... But I keep it cool, delidded and with liquid metal on a NH-D15.
Still working on the daily evening reboot that it does.
There is the odd thing with the unchanging cpu voltage(1.09999v) on booting. I have to open RyzenMaster and click on "Reset".
Rmaster says it did reset (something unknown) and NOW the voltages will change with load. Even with the bios voltage on AUTO it still boots STUCK at 1.09999v until a Rmaster "reset". Never read anything about this before.
So close but still HAVE to run Rmaster after every boot. (I turn my pc off at night)
Pretty interesting, that sounds quite frustrating to be honest. I think you should try to set aside a weekend day and find a good reputable AMD Zen 2 or 3950x specific bios OC guide, preferably one that uses your exact motherboard, reset your BIOS settings, and try to get it clean. I'd recommend starting from a known good state, e.g. stock settings, possibly with PBO (the thing that boosts voltages automatically? right?) off, etc. Make sure that it is stable at a baseline configuration. Maybe you have something going on with your OS install. Maybe you should run memtest to make sure your memory isn't faulty and causing the weirdness. And you can do this over a few days too, keep a notebook of your settings you changed and stuff. Good luck