HP 8740w Cooling Upgrade

[triturbo]

This is work in progress, but so far I’m happy with the results 😄 

 

The heatsink:

https://imgur.com/a/v2gq5dB
 

The fans and their electronics:

https://imgur.com/a/mr88Xgn

 

That’s it for now. 

[Annihilator]

i like ur frankenstein elitebook 😄

[GuitarG]

Interesing job ! Any benchmarks pre-mod and after ? 

 

[triturbo]

Will do, once I put it in a laptop format, so everything is fair and square. I’m estimating 20 to 30*C difference so far. Exact measurements would be next month. 

[Daedalus]

Nice work. Doing similar fan work on my 8570w. How does the mod see both fans? I see some (pavilion units) just split the fan feed on all wires and it seems fine. 

[triturbo]

I have two versions. One drives the Acer fans, the other drives the ZBook fans. Both are wired the same - Juice, Ground and PWM come from the same source, while Tach is only linked to one fan and everything is fine. For the ZBook fans (5V) everything comes from the stock connector and it’s been like that for quite some time with no issues. Acer fans (12V) require some extra circuitry since there’s no direct 12V output. BTW they (Acer’s fans) consume about 15W alone at full tilt. 
 

EDIT: Here’s the wiring of the ZBook fans:

 

https://imgur.com/gallery/8L0QhNk