Losing fan control during a game

I recently replaced my old AMD Ryzen 9 3900X with a 5950X. I also installed a 3-fan DeepCool AIO. I currently have 4 fans installed 1 CPU fan connected to the mobo cpu-fan slot and the 3 DeepCool fans in: sys-fan1, sys-fan2, and sys-fan4 mobo slots. Running normally the fans would keep the 5950X at about 130F idle.

I now use HwInfo64 after each boot and it speeds up the fans noticeably and keep the 5950X at about 113-120F idle.

However, I began noticing that after starting The Last of Us game, the fans would quiet down and would only be noticeable sometimes during the game reving up and then quieting back down, etc. After quitting the game, the fans would return to their HwInfo64 rpms.

Running Elden Ring doesn't affect the fans in any way. How or why would a game take over managing a PC's fan speeds? I have never heard of this before.

What are you using to control the fans? I had all kinds of problems like that when I had a gigabyte board and used their software app to control the fans. I ended up getting rid of their software and setting the curves in BIOS. Didn't have issues from then on.

rzn6jw said:

How or why would a game take over managing a PC's fan speeds? I have never heard of this before.

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The game does not manage fan speeds, not directly. The fan speeds are dependent on the temperature monitoring of the CPU and GPU.

The temperature will depend on the power consumption of the CPU and GPU which will vary depending on the game, how it is written and what is happening during the game.

In looking around, Last of Us is a CPU dependent game from PS5 that was ported to PC. In a steam thread, one user shows mentions that his 5800x shows only 2 - 5 % CPU usage when playing the game, indicating that the game is GPU dependent on PC rather than being CPU dependent.


The post right after lists full specs of system and shows also very low CPU usage as well.

Your CPU is not being used much. You can verify that by looking at actual CPU usage while playing the game. It is is below 10% usage, more than likely there is almost no need for the fans to run at all.

Helmut, with HwInfo64 I have a constant ~2400 rpm on the DeepCool fans (speed increases when CPU gets hotter). When TLoU starts up, the fan speed decreases, then it's up and down as the game goes on. Game end, back to constant speed. So somewhere in the code or something, the game ends up apparently controlling the fans. CPU usage by the game is only 2-3%.

rzn6jw said:

Helmut, with HwInfo64 I have a constant ~2400 rpm on the DeepCool fans (speed increases when CPU gets hotter). When TLoU starts up, the fan speed decreases, then it's up and down as the game goes on. Game end, back to constant speed. So somewhere in the code or something, the game ends up apparently controlling the fans. CPU usage by the game is only 2-3%.

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It's not the game controlling the fans... it's the temperature.
Always set the fan curves in the BIOS. Don't use those 3rd party fan speed utilities.

rzn6jw said:

I recently replaced my old AMD Ryzen 9 3900X with a 5950X. I also installed a 3-fan DeepCool AIO. I currently have 4 fans installed 1 CPU fan connected to the mobo cpu-fan slot and the 3 DeepCool fans in: sys-fan1, sys-fan2, and sys-fan4 mobo slots. Running normally the fans would keep the 5950X at about 130F idle.

I now use HwInfo64 after each boot and it speeds up the fans noticeably and keep the 5950X at about 113-120F idle.

However, I began noticing that after starting The Last of Us game, the fans would quiet down and would only be noticeable sometimes during the game reving up and then quieting back down, etc. After quitting the game, the fans would return to their HwInfo64 rpms.

Running Elden Ring doesn't affect the fans in any way. How or why would a game take over managing a PC's fan speeds? I have never heard of this before.

Click to expand...

I to would use the BIOS settings to control fans and speeds. Check BIOS to see what sys 1, 2,3,4 are set to monitor the Motherboard or CPU. My ASUS board gives me this choice. Your using 4 pin fans PWM a standardized pulse signal that controls the fan speeds Pulse Width Modulation.

rzn6jw said:

I recently replaced my old AMD Ryzen 9 3900X with a 5950X. I also installed a 3-fan DeepCool AIO. I currently have 4 fans installed 1 CPU fan connected to the mobo cpu-fan slot and the 3 DeepCool fans in: sys-fan1, sys-fan2, and sys-fan4 mobo slots. Running normally the fans would keep the 5950X at about 130F idle.

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Why? Why not connect it the way Deepcool recommends in the manual and use the included 3 fan adapter/connector to connect all three fans to the CPU fan header? From the manual,




Also no mention of if or where you connected the pump to.

stormy13 said:

Why? Why not connect it the way Deepcool recommends in the manual and use the included 3 fan adapter/connector to connect all three fans to the CPU fan header? From the manual,

View attachment 63563


Also no mention of if or where you connected the pump to.

LT720 - DeepCool

The DeepCool LT720 high-performance liquid CPU cooler provides strong heat dissipation power with a 360mm radiator, three precision-tuned FK120 fans, and a multidimensional infinity mirror top cap. - DeepCool was founded with the mission of providing professional, innovative, high-performance PC...

us.deepcool.com

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thought that to !! Good one

OK, so my fans are at ~2400rpm on the desktop, no games or programs outside of normal Windows stuff running. Start TLoU and the fans drop to <1200rpm then vary throughout the game. Sure, I can see the temp getting up to 150 but the fans increase, then decrease, then increase, etc until the game ends, then back to ~2400rpm. What I'm saying is the game takes control of the fans to drop them below 2400rpm, they vary from there depending on temp, then they're back to 2400rpm when the game ends.

If temp dictated the speed, and the 'normal idle' speed was ~2400rpm, then, when running the game, the speed should vary from ~2400 upwards and downwards back to 2400rpm, not drop like it's doing. Again, this doesn't happen running Elden Ring, Uncharted, the Witcher 3, God of War, or Jedi Survivor, just TLoU so my curiosity was up.

I originally had the fans connected as in the DeepCool diagram but I wanted to control the 3 fans independently.

Ok let's come back to how the fans are connected,

I recently replaced my old AMD Ryzen 9 3900X with a 5950X. I also installed a 3-fan DeepCool AIO. I currently have 4 fans installed 1 CPU fan connected to the mobo cpu-fan slot and the 3 DeepCool fans in: sys-fan1, sys-fan2, and sys-fan4 mobo slots. Running normally the fans would keep the 5950X at about 130F idle.

Click to expand...

What fan is actually connected to the CPU header? Also according to the specs for the fans that came with that AIO, the only way you are going to have any of them running at 2400 RPM is if they are at 100% and running at the rated +/- 10%,



Also why would you want to run the fans on the AIO independently?

I wanted to see if I could get them to each run individually and get an independent curve going. I guess this has gotten a little out of hand now, so I went back to the original installation of 3 on 1. I'm happy with that.

Sorry about all the confusion and thanks for taking your time on this quest.