What a coincidence, I noticed the other day that the GT 1030 I used for a long time in a PC for not games, that its hotspot is just a 10 deg C offset! Many many months I used that card and never noticed it was just a 10 degree offset lmao. After figuring it out I watched it more closely and also found it must be calculated in a weird way, beause very very very infrequently 10 changes to 9.9 or 10.1.
Anyway, about the 5800X3D - the Tctl/Tdie is definitely not an offset because I've been watching it a lot and it varies a lot. Unless a multiplier is used for the offset - a fraction derived from a temperature delta or something crazy. It especially annoys annoys me because the "CPU temperature" that the BIOS uses, is that... It's able to swing pretty wildly, up and down 10-15 degrees while the cores are only moving 1-4 while the power's not changing much (and I'm looking at the summed value of both regulators (in watts) that drive everything on the CPU package afaik).
It might be. If it is though, it's the weirdest hotspot I've observed -- most often I find it's pretty close to the temperature of the cores and the other CPU sensors, maybe 2-3 degrees warmer than the cores. Mostly its just a different temperature during high throughput data processing (as mentioned in OP). Though power doesn't increase much over normal use, temps rise high and make my fans noisy. At this point I basically have them only spin faster than idle once 72 degrees is reached. I have enough and they're big enough and moving enough air that even though they don't spin up until 72 degrees, at idle with 3-5% CPU utilization, (cores 15W, SOC 18W, package power 40W)
1.) average core temperature is 42.2 degrees
2.) CPU CCD1 (Tdie) is 48.9 degrees
3.) CPU die (average) is 48.4 degrees
4.) CPU (Tctl/Tdie) is 53.1
5.) L3 Temperatures average 41.6
I don't know what it is about Tdie... in #2 and #4 above it's included. #2 by itself, and #4 with Tctl. Tctl isn't listed anywhere by itself that I can see. If 4 is the average of Tctl and Tdie, then
hypothetical Tctl would be 57.3 degrees!
But that could be nonsense.. probably is.