No, these temperatures aren't typical for a 7800X3D.
No, these temperatures aren't typical for a 7800X3D.
hello, your new build is coming together well so far. I ran Prime95 Small FFT on your 7800x3d with a Corsair 4000D airflow setup using the Lian Li Gahad II 360 AIO and ASUS ROG Crosshair X670E motherboard with 2x16GB DDR5 6400. the temperatures and clock speeds look normal for this configuration. regarding the idle picture, it also appears stable—just keep an eye on things as you continue testing. I understand this chip isn’t known for great heat management, but you weren’t expecting such high temps.
You can't view the per-core timers in your screenshots; you need to enlarge this part of HWiNFO. Still, my 7800x3D model runs airstream cooled (Assassin IV) and stays under 81°C during Cinebench R23 (scores just above 18k). Clocks in the 4.85Ghz range are all-core. PBO plus Curve Optimizer -20 applies undervolt to all cores. Idle temps sit around 40°C.
7800x3D differs from non-X3D models; stock prices stay around 84-85. CO is under-volted even more. It features a 360 AIO, suggesting either high ambient temps or poor mounting. (I used a 7900x before)
TDP for 7900X is 170W, 7800X3D is 120W. It's lower but still quite demanding on the CPU. The 7900X can handle higher clock speeds, which partly accounts for its power consumption. If you have sufficient cooling, 7800X3D should operate more efficiently—about 40% better heat dissipation could bring temperatures down by roughly 10°C compared to your current X3D CPU.
The goal was to cool the 7800x3D using air instead of water, achieving cooler temps than what he observed with a 360 AIO. The 7900x also ran air cooled. During a Cinebench test, the 7900x consumed around 200w, whereas the 7800x3D used about 90W. Even with a -40 CO undervolt and an 85°C temperature cap on the 7900x, it still managed over 30k in Cinebench. These components are built to handle lower voltages.
The maximum on AM5 is around -30°C, while on AM4 it's limited to -30°C as well. It seems the setting you're seeing is quite low compared to what you'd expect for a 360A AIO setup. This might be due to your specific testing conditions or a short bench run rather than a full-scale test.
I reside in Belgium, where the environment is quite pleasant. However, I agree you're correct—while idle temps sit between 45 to 50 degrees, your fans keep increasing unnecessarily. Would it help to replace the CPU and reinstall the cooler to observe any improvements?