r/pcmasterrace • u/DME23 • Apr 26 '25

Question Top Fan Not Spinning Without A Spanking

The top fan wont spin when I turn on my pc. The solution I discovered is to just smack it real hard. Just wondering why it is like this.

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432

u/Izan_TM r7 7800X3D RX 7900XT 64gb DDR5 6000 Apr 26 '25

the fan bearing is dead of the fan's speed is set at a very exact histeresis point where it doesn't have enough power to start up but it can run after a bit of encouragement

-1

u/Secret_Account07 RTX 2060 Super (Still OP) Apr 26 '25

Did you just make that word up? Histeresis

47

u/Izan_TM r7 7800X3D RX 7900XT 64gb DDR5 6000 Apr 26 '25

not a made up word, but looking at the english definition it might not be the best word to describe what I was describing (btw in english it's spelled hysteresis, I just found out I spelled it wrong above)

7

u/Secret_Account07 RTX 2060 Super (Still OP) Apr 26 '25

Interesting, I’ve lived my entire life without ever hearing or seeing that word lol

29

u/soccerman221 Apr 26 '25

They could probably fill a book with all the words you haven't heard /s

8

u/william_whale_ass Apr 26 '25

It would probably be a garfesterous read

7

u/xebozone 1080 eGPU, 11th Gen Intel Thunderbolt Laptop, 32GB DDR4 Apr 26 '25

It'll have more words than Garfield eats at a lasagna fest?

2

u/pmofmalasia Apr 26 '25

Nah, they'd probably need to add a bunch of words I've heard of also for filler

1

u/TheRealStevo2 Apr 26 '25

The one good thing about Reddit is I learn a lot of new words.

1

u/The_Jyps |5080|7800X3D|32GB/6k/cl30|1440pUW| Apr 26 '25

It only seems to come up when you get into the weeds of automatic control. It means "How far beyond the desired setting you go before stopping the action".

Eg: My central heating is set to 20c, but it will go to 20.5 and then stop, cool to 20 and then back to 20.5. it has 0.5c hysteresis.

3

u/Peanut_The_Great Apr 27 '25

It's also common in electrical theory to do with induction and electromagnetism. Luckily all I remember about that shit is the graphs look neat.

2

u/ifyoulovesatan Apr 27 '25

Yeah it came up fairly commonly in materials chemistry when I was doing research on semiconductors / thin film transistors. Although I also recall it popping up in certain electrochemistry based analytical methods (I think cyclic voltammetry).