A quick observation about heatsinks and their connection to the CPU. When I first fitted my 40mm x 40mm heatsink I used some ''thermally conductive tape' (https://www.amazon.co.uk/gp/product/B075R9RGXF)'. It seemed to work, but I was suspicious because it seems to be about 1mm thick, and internally it seems to have a foam construction. I can't see how that can be good for thermal transmission.
So I reaffixed the heatsink using a small blob of 'silicone heatsink compound' (https://www.amazon.co.uk/gp/product/B00YCMR04Q). I wasn't sure it would work in my application, as my RPi is mounted on edge and the heatsink is fairly heavy, and I don't think the compound 'sets'. But it seems to be holding perfectly, and the better thermal contact has had a noticeable effect. With my fan turned on at 12:47, the temperature dropped by about 10 degrees in 4 minutes - that's about twice the drop I recorded when the heatsink was fixed with thermal tape. The non-fan temperature of 61 degrees is also about 3-4 degrees lower than the same test with thermal tape. [image: http://www.cjh.me.uk/MyPhotobucket/cache/DIYHifi/40mm%20with%20compound_480.jpg] This is the earlier test with the heatsink held on with thermal tape. Identical test conditions - if anything, the ambient temperature is warmer today. [image: http://www.cjh.me.uk/MyPhotobucket/cache/DIYHifi/Pi4%20with%20fan_480.jpg] Perhaps the thermal conductive tape should be renamed 'thermal insulating tape'. ------------------------------------------------------------------------ chill's Profile: http://forums.slimdevices.com/member.php?userid=10839 View this thread: http://forums.slimdevices.com/showthread.php?t=110690 _______________________________________________ discuss mailing list discuss@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/discuss
