9800x3d - What Temperature to Monitor?

Ivrim

New Member
Hey everyone, just recently picked up a 9800x3d and I'm curious what temperature sensor is the correct one to keep an eye on. I'm coming from a 8700k and I know on that CPU you would monitor whatever core reading was highest and go from there. Well on the 9800x3d it seems like its not that simple as I haven't be able to find a definitive answer. I just want to make sure I'm running this at safe temperatures. It seems that for the 9800x3d its between Tctl/tdie, CPU Die average, and CCD(Tdie). If anyone could provide some input, I would greatly appreciate it as I'm new to AMD and I'd like to not fry this CPU. Thanks.Screenshot 2025-01-03 090910.png
 
All values are correct, they represent just a different evaluation among dozens of thermal sensors inside the die.
 
I should rephrase my question, basically I'm asking, since on AMD's website they state 95c is the TJMax. When they're saying this, what reading are they referring to? Is it just any of the temperature sensors? Another example is that for my 8700k people would say, "Don't go above 80c" and I knew they were referring to not letting any of the individual core readings go above 80c.
 
I should rephrase my question, basically I'm asking, since on AMD's website they state 95c is the TJMax. When they're saying this, what reading are they referring to? Is it just any of the temperature sensors? Another example is that for my 8700k people would say, "Don't go above 80c" and I knew they were referring to not letting any of the individual core readings go above 80c.
Potentially all those 3 sensor can reach the specified Tjmax depending the task load, but its more like to happen on all core loads (at 150-165W) if the cooling cant keep it below that 95C threshold.
You may see also a couple or more of individual core temps also around there. Those would may be the cores prioritized by OS.
You could see values at 95C (+/- 1C). Critical (shutdown) temp should be at around 115-118C for Zen4/5. While the 95C operating limit is considered perfectly fine you can always specify your own limit in BIOS.
For example my Zen3 CPU has a default limit of 90C but I've set it to 85C, even tho it never reaches it, let alone the 90C.

Even anytime if you observe individual core sensors some of them will match those 3 or be close. Even if its way below 95C.

Tctl/Tdie is suppose to be the hotspot among CCD sensors. Its most certain that this value will have the highest avg (4th sensor value) like we see in your screenshot the 42.5C.
Die (average) is what it says, avg among all core sensors with a time filter (dont know exactly what that means).
CCD1 (Tdie) I believe is from 1 specific sensor close to the cores... At least it used to be like that but I understand on last gen (9000) AMD has changed some things about the temp sensor-ing system.

AMD has no name really for the temp sensor controlling the CPU and uses its own proprietary method to calculate temp and apparently the temp threshold internally in the CPU.
What @Martin has said on other threads is that the Die (average) matches better the AMD reading.

To get a sense below is my 5900X running OCCT.
Power draw of the CPU is around 195W at that test.
See how all 3 sensors are about the same temp level along with a couple core sensors (Cores 1 and 3)

Untitled_232b.png

And this below is under regular usage.
This (low load) situation is where you'll find the most differences among those 3 sensors, maybe up to 10C.
On all core loads all 3 are almost matching and even under gaming (which is middle load) they will be more consistent with each other.

Untitled_233b.png

and another low load

1736036512494.png
 
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