I use a Raspberry Pi as a low-power website server and as a UPS controller. It has a heavy-duty heat-sink without a fan and runs consistently at around 39 degre

I use a Raspberry Pi as a low-power website server and as a UPS controller. It has a heavy-duty heat-sink without a fan and runs consistently at around 39 degrees. Its power source is the UPS that it controls. But I specifically used a slightly-slower high-endurance micro-USB card to prevent overuse wearing-out of the card. [I also use these same cards in my dash-cam.] The cards I use are made by Sandisk, but no doubt other companies make them too. The ones I have are white, probably to distinguish them from 'normal' cards. While I haven't had any problems at all in using these cards, their slightly slower speed makes them look like a 'fail' using the raspberry pi testing app.