have just replaced my fan with a sunnon 60mm from the default nasty fan installed as aprt of the kickstarter. Yes its on all the time as its not a 3 pin fan but i would rather have a cool UDOO BOLT thats still much quieter than a fan thats on an/off all the time. Fan is a : MF60101V1-1000U-A99 60x60x10mm 12V= 27,7m³/h 28,5dBA Sunon =MB60101 https://www.mouser.co.uk/ProductDetail/Sunon/MF60101V1-1000U-A99?qs=EU6FO9ffTwfZzVq/VzJrBQ== I also replaced the Paste with some Arctic silver 5 paste and the temp are way better than before. Under prime 95 load it does a max of 56c and min of 34c. i think this is great, and now its ultra quiet. Awesome.