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Another XPS 8940 cooling upgrade
Like many other buyers of the XPS 8940, I was also very disappointed with the factory cooling of this computer.
In my case, the video encoding takes up to 100% of the CPU load for up to an hour. This also heats up the CPU VRM controller and, what's worse, the two small electrolytic capacitors right next to the heat sink of the controller.
While reading other posts, I found a 120mm fan mounting frame and attempts to replace the CPU cooler. Thanks good people for sharing the drawings for free! The first thing that caught my eye was the naive belief of people that the motherboard would regulate the speed of the fans. You have to take this matter into your own hands and use additional PWM regulators by installing them between the motherboard and the fans - as in the attached photo.
I used modules bought from China on ebay. They regulate the speed according to the temperature - they are easily programmed.
The final effect is excellent, the core i9-11900 reaches 58 degrees at full load. Voltage regulator 36 degrees (it was 75 degrees).
The temperature of the graphics card is not my problem, I do not burden it with my tasks.
I hope that somebody will find the presentation of my cooling fixes useful.
It's very quiet cooling! This is an important parameter for me.