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I want to buy a Raspberry Pi 3 Model B in a week, and I want to see if this SD card, a Sandisk Extreme 32 GB is good for the Pi? Also, I want to know if I can add an air cooling without heatsink?

  • That SD card is okay, and you can use the Raspberry Pi 3 without heatsinks. You may want heatsinks if you put the Pi 3 into a cabinet with other heating components, e.g. a hard disk. – Janka Feb 1 '18 at 12:47
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    Put that as an answer, @Janka And add more detail – FreezePhoenix Feb 1 '18 at 13:02
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That SD card is fine. I have a couple. They are actually kind of overkill, because the SD card reader on the Pi cannot read as fast as the card is rated.

add an air cooling without heatsink

This is probably not worthwhile. Think of it like your smartphone; I have never seen one with fans on. And your smartphone probably has more heat generating potential.

People do add fans to the Pi though, and there are other people around that will happily sell you a little 5V one if the Pi all by itself is too quiet for your tastes.

The Pi 3 is the only model with serious potential to overheat when not overclocked. You can tell by touching the SoC, if it is accessible; it should be noticeably warm but not uncomfortable for your skin.

You can also check with vcgencmd measure_temp. Idling, it should be 40-45 C. When it is busy, it may get into the sixties. If you notice it getting to 75 C or more, try a heat sink before you bother with air. Air without heatsinks is not very effective at cooling small dense chips.

  • At 60 C the processor is downgrade to 600 Mhz, and loose 600 Mhz of power is very much and the problem with heat sink is if i want to add something on the raspberry (like leds) i can't because heatsinks take the place – Mickou Feb 1 '18 at 16:24
  • That's great, but unless you get a separate 4-6" 12V fan, you will probably be wasting your time blowing air without a heatsink. – goldilocks Feb 1 '18 at 17:27
  • BTW, the firmware throttling doesn't start until at least 80C. The chip is rated to 85C. – goldilocks Feb 1 '18 at 17:39

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