Wednesday, November 23, 2016

Attaching heat sinks to the Raspberry Pi for overclocking

,
My Raspberry Pi was getting a little hot when I overclocked it to above 1100 MHz.
So I decided to attach some heat sinks to it.
All you need to do this are the following:

  • Some heat sinks (copper or aluminum depending on your preference)
  • Thermal adhesive, I used Arctic Silver
  • Isopropyl alcohol
  • Lint-free cloth
  • Some clamps
  • A clean surface
Unplug your Raspberry Pi and put your it on a clean surface like so:

I got this heatmap from modmypi.com and put heat sinks over the  three hot spots.
Start by cleaning the black surfaces of the hot spots with the isopropyl alcohol and a lint free cloth.
Once that is dried, its important you dont touch it or get anything on it.
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Next get your heat sinks and thermal adhesive ready. Instructions should come with your thermal adhesive but it is commonly to mix a 1:1 ratio on a clean surface. Wait 1-2 minutes for it to thicken just a little bit then spread a thin layer on the processors and attach the heat sinks. Make sure to hold them down with rubber bands or clamps while they cure.

I was able to get a 6 degrees Celsius difference from the commands:
/opt/vc/bin/vcgencmd measure_temp
cat /sys/class/thermal/thermal_zone0/temp

With this done, I have the following stats in /boot/config.txt and they seem to be stable

force_turbo=1
over_voltage=8
arm_freq=1180
sdram_freq=500
core_freq=500
gpu_freq=350


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