Hey everyone! I recently upgraded my CPU from a 5900X to a 9800X3D and switched out my cooler to a Deepcool Assassin IV. However, I'm hitting some really high temps of 96°C during benchmarks like Cinebench, shader compiling, and antivirus scans, which max out the CPU. When idling, my temps are around 37-40°C, and they go up to about 70°C during gaming. I didn't change many settings besides enabling EXPO and adjusting the fan curve, and I also removed the plastic sticker on the heatsink and reapplied thermal paste, but nothing seems to help! Any advice on why this is happening?
5 Answers
You might just need to try different cooling solutions—my setup with a Noctua D15 peaked at 91°C in Cinebench but averaged around 55-60°C during gaming. If components are relatively new, it’s worth checking the thermal paste application again just in case.
Your idle temps are perfectly fine, and it's normal for this chip to run a bit hot, especially under heavy loads. As long as it's boosting properly, you shouldn't worry too much. But, if you're uncomfortable with the heat, consider dialing back the power through undervolting or tweaking some settings.
How can I tell if it's boosting properly?
Those temps are definitely on the higher side for sustained load. I suggest trying a negative PBO curve—start with around -15 and see if that helps lower your temps a bit without affecting performance too much.
It sounds like your CPU is just doing its thing. But there are reports of the 9800X3D hitting those kinds of temps under full load, so running a -15 CO undervolt could help. My setup peaked around 85-86°C with similar settings, but I managed to reduce it significantly with undervolting.
That seems pretty high! It might be an airflow issue in your case. When I tested my 9800X3D with a Lian Li Hydroshift 360, I usually saw temps around 70-80°C even during stress tests. You should check the airflow setup—make sure you have enough intake and exhaust fans to keep things cool.
I doubt it's an airflow issue. I've got 3 intakes in the front and 2 exhaust fans in the Corsair 4000D case. Everything looks good on my end!
That's a notable difference! What about your case? I've got a similar cooler but I feel like I could use better airflow.