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Lenovo M75s Gen 2 - Cooling upgrades

A

anabioz

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Got my hands on Lenovo M75s Gen 2 Desktop with Ryzen 3 4350G.


I was not happy with the cooling and the CPU, so I took it apart and did some upgrades. This post is intended to share some ideas on how SFF can be upgraded to have better cooling. Temperatures under 100% load were reaching 90C with a stock cooler.

1. Replaced the 4350G with 4750G and installed Crucial Pro DDR4-3200 64GB (2x32GB) Kit.
2. Got the replacement cooler: https://www.newegg.com/raijintek-0r100004/p/13C-001T-00011
3. Got Metal Drill Bits: https://www.amazon.ca/dp/B07B4LCWC4
4. Sandpaper: https://www.amazon.ca/dp/B08TBW22FL
5. Fan dust filters: https://www.amazon.ca/dp/B0BMXLGLNX

--

Let the upgrade begin:

Used the Intel mounting bracket with screws from Thermalright's PA intel kit.

1690173011161.png



Then installed the actual cooler:



1690173064897.png

1690173269341.png


To improve airflow of the case, I needed to drill some holes in the side panel (don't judge me on this one)


1690173140624.png


And installed a small rear fan for exhaust:

1690173223886.png


The temperatures dropped by ~ 30C under full load (from ~90C to 58C) and idle is around 33C. Well worth it.
 
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sswilson said:
Heh.... yeah, self drilled holes never seem to come out quite as symetrical as we would like... :)
Click to expand...

We all started somewhere, it was a first time for me. Next time will be better, I hope!

The thermal design of this system is pretty bad. It has no air circulation workflow. I had to flip the case upside-down to create somewhat a natural airflow:

1. CPU at the bottom (with hot air moving up to the top of the board)
2. Exhaust fan on the top (split between exhaust fan and psu in-take fan)
 
anabioz said:
We all started somewhere, it was a first time for me. Next time will be better, I hope!

The thermal design of this system is pretty bad. It has no air circulation workflow. I had to flip the case upside-down to create somewhat a natural airflow:

1. CPU at the bottom (with hot air moving up to the top of the board)
2. Exhaust fan on the top (split between exhaust fan and psu in-take fan)
Click to expand...

Not sure if it's still around, but at one time there was a pic on here of a self drilled 80mm fan guard that I made up. It was most definitely not symmetrically pleasing to the eye.... ;)
 
Just picked up an m75s and hoping to give it a similar treatment. Mine has a heat sink occupying space just in front on the 12v rail. It’s giving me some grief when trying to install the CPU cooler mounting bracket. Did you run into the same issue? If so, did you just remove the heat sink altogether or do something to supplement it?
 
Fantastic results. Since you are using the dust filter, you could probably cut a to more metal out if you want. Factory holes were stock heatsink sized then I take it?
 
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