I have BPI-R4 with Quectel RM520-GL running openwrt 24.10. I’ve only just got the 5G connection running properly within the last few days. Today I noticed that the 5G module was 96°C, despite the router having a cooling fan installed, and another running underneath it. I wouldn’t say it is running especially hard, besides browsing and streaming a movie. Can I do anything with either configuration or physically to reduce the heat?
For my case, im using big fan over the module itself 40x60mm fan Rm551e gl average 40° - 50°
Would you mind sharing how you have the fan set up over the module?
Sure, here you go
I had smaller fan 10x40mm over modem heatsink, its better and practical solution for most cases but for me i wouldn’t care about how things LOOKs.
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Noctua fans dimensions please?
Two 40x40x10 fans. One cabled to pwm and one to gpio pwm
Are you able to close the case with dimensions of the fans?
And the 10mm height is the maximum fan height with the default case. I tried a 15mm but then you don’t really have much heat sink at the cpu. Another tryout was to fix the fan on the heat sink but was too noisy.
wouldnt be better to put a 80mm on top?
[NF-A4x10 5V PWM] is doing 5.24 CFM
[NF-A8 5V PWM] is doing 32.67 CFM
you have full list here: https://noctua.at/en/products/fan + conversion for m³ here
Of course, but i am stable at 40° with fans at around 40%. Another nice to have is that i can control both fans for two thermal zones (cpu+modem) separately 
But i also plan to try out a solution with a fan on the top, but with the NF-A9. Another thought would be taking two NF-A6 fans 
i wish i could by only the top plate for easier experimenting 