30 PCS Raspberry Pi 4 Heatsink Kit with Thermal Conductive Adhesive Tape Aluminum Heat Sink Cooler and Copper Heatsink for Raspberry Pi B B+ 2/3/4

All temps in Celsius......... Since you have to pull out a mortgage to get your hands on a RPI I settled on the OrangePi 5. I can verify that these "work" on it. The CPU sink is just a tad smaller than the CPU. But the memory sinks are spot on. As stated elsewhere, the adhesive tape they put on them is GARBAGE! Max'ing out all the cores the OPI5 will show temps in the 85 range without heat sink (but with a fan blowing straight at it). Adding the heatsink to the CPU with the garbage tape they supplied, it gets down to about 75. I peel the tape off, scratched away all the gooey residue, cleaned the contacts with a qtip and alcohol, and used some Arctic MX-4 compound I have laying around. Temps are now around 60-62 under full load. Could probably get down under 60 if these were a little bit taller. But for now, it seems like these are just light enough to stay stuck on with the grease. I plan to have my cluster built with them standing up on their side, so I will soon see if the grease is enough to hold them on. Will update if not. I'm thinking a day or 2 to let the grease set up. As for temps, I'd say with thermal paste these are just fine.

Cooling system very easy because of its aluminum material. Very easy to install and it has adhesive to put onto pads with no problem. It also has a copper piece with the raspberry pi logo on the opposite side which is also cool I really like that. So it cools on top and also on the bottom dissipating heat. So great usage. Definitely five stars comes with every pad you basically need even if some are bigger than the pad that's still pretty decent for heat dissipation either way. Cons? If you put it on the wrong device it's hard to take off? Lol no real cons

I used them in desktops graphics card and in my laptop for improved cooling.

These are installed where I could on my Mac Pro and they adhered perfectly and months later they are still working great. I recommend this for anyone looking for those small little cooling upgrades to help cool any electronic device that they will fit.

Definitely keeps the temps lower, especially when stability is a concern