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44947
780, CPU fan pin out
Anyone knows the purpose of five CPU fan pins? I need to connect a non-Dell fan which has four wires. Is there 12 V, ground, RPM and PWM as usual or there is some proprietary fan control in place?
speedstep
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September 11th, 2018 04:00
Dell sometimes swaps the wires around so that you will fry a dell fan on standard and the other way round.
It has 5 pins but only 4 wires are used.
Dell does not publish this. And some dells use standard wiring.
I believe this is correct.
YMMV
Dell MB
Pin Number
Function
Dell wire color
Std Fan
Pin Number
Std Fan wire color
Description
1
Sens (TACH)
White/Yellow
3
Green
Sens (TACH)
2
+12v
Red
2
Yellow
+12v
3
Gnd
Black
1
Black
Gnd
4
PWM
Blue
4
Blue
PWM
5
Key
unused
Von_Zipper
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September 11th, 2018 05:00
Thank you! I can't say I wasn't searching, but you saved my day. :)
nex86
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October 22nd, 2018 10:00
I have an adapter thats exactly wired like this,
but I'm getting a Fan failure error when trying to use my Noctua PWM fans.
Any solution for this?
speedstep
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October 23rd, 2018 10:00
If you plugged them in wrong you have fried your fan sensors on the fan and perhaps on the board.
speedstep
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April 18th, 2022 21:00
@nex86
"I have an adapter that's exactly wired like this,
but I'm getting a Fan failure error when trying to use my Noctua PWM fans.
Any solution for this?
The other fan error is because Dell fans are 4000 RPM fans that use 24W of power. Dell fan should be kept and a Y cable used if you want to pass Diags and use additional fans.
Dell #7M0F5-A00
Delta # AFB1212EJ-01
kramyugtaht
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December 9th, 2022 15:00
Thanks speedstep for the valuable info as always, I would pay you instead of Dell if I could. I'm not inclined to purchase new Dell hardware given this kind of practice, setting people up for failure just to make a few bucks.