jc_denton for NBR

The 4th header on the P870TM1-G has actual power running trough it, and will power a small 5V fan. However, the fan has to be correctly rewired, as the 4-pin header on the motherboard does not use a standart pinout. Meaning, if you plug in a standart 4-pin fan without rewiring, you might short something on your motherboard.

Header pinout:
PIN 1 is 5V PWR
PIN 2 EC (TACH)
PIN 3 BUS SWITCH
PIN 4 GROUND

What you want to do is to leave pins 2 & 3 unterminated, only populating pin 1 and 4 to power the fan. This will make the fan run 100% always. I've been running this mod since mid July 2019 without any issues.

https://imgur.com/a/CSOMm0H
You can use the link up above to get an idea of what pin is where (for reference black is ground and red is 5V)

The fan I used to test the concept, temp reduction was 4-5c when compared without the mod.
https://www.elfadistrelec.dk/da/radialventilator-dc-53x5x56-4mm-5v-69m-sepa-hy60q05ap/p/30037298?track=true

Heres a link to another user who also has done the mod with a different fan for perspective:
http://forum.notebookreview.com/threads/official-sager-np9877-clevo-p870tm-g-owners-lounge-phoenix-4.809589/page-290#post-10858089