CPU Fan not speeding up at high temperatures when case fan is on.

G

Guest

Guest
I have a large (200mm) intake fan on my case window, when it's running my CPU fan stays at low speeds (3,400RPM), and my CPU overheats under load (~78c). Now when I unplug that fan, my CPU Cooler spins up to full speed (5,000-7,000 RPM) And my CPU stays at ~55c under full load.


Also I am using the (older version) of the stock cooler for the AMD FX-8350.



I tried using speedfan but that just multiplies my current fan speed by the percentage (so if I put it at 100% no change, 50% cuts it in half)




Please explain to me why more airflow would make my CPU fan slow down and let my CPU majorly overheat?
 
Solution
G
I have the Asrock 990fx Extreme 3

Also, my "Auxtin" sensor used to work a few months ago, it broke a few weeks ago and now just reads 2-4c (Before i got my new case, with the large intake fan, so before this problem started)
G

Guest

Guest
I have the Asrock 990fx Extreme 3

Also, my "Auxtin" sensor used to work a few months ago, it broke a few weeks ago and now just reads 2-4c (Before i got my new case, with the large intake fan, so before this problem started)
 
Solution

davo6233

Prominent
Dec 10, 2017
7
0
510
same problem here. When I connect additional fans on MoBo, my CPU fan decrease fan speed at half... I didnt fin out solution yet

MoBo: MSI 970A Carbon
CPU: AMD FX-8120 with stock cooler