🔥 Geekworm 12mm Aluminum Alloy Heatsink (C235) with 30mm Cooling Fan Support – Compatible with Raspberry Pi Compute Module 4 CM4 Motherboard Review

Most likely just a casting, hardly machined. It's all powder coated so file/sand/buff the finish on the SOC riser for best results. The included thermal pad isn't too bad, although I replaced the SOC pad with a silver one after a while. Average SOC temp with thermal pad was 40°C (hovering around 60°C without heatsink), with Arctic Silver I didn't see SOC temps over 38°C under reasonable load. In general, an excellent product and small "cons" are fully justified by the low cost.

Worst of all I find the screws: Both the heads and the nuts are too thick to fit between the cm4 and the I/O board and they are short, to fit through the I/O board into the racks below. Thermal tape is a joke and doesn't sit flat on the chips so make sure you don't over tighten and crack the board. I could drill holes for the screws to go through and fit into the I/O board standoffs, but overall: not worth it.

Bad design product. The heatsink does not touch the processor with thermal tape, making it unusable. I've tried applying thicker tape but it bends the board when the heatsink is screwed on.

This heatsink works surprisingly well. I initially gave a bad review because the supplied mounting screws and nuts didn't fit - I couldn't connect to the carrier board at all with the heatsink installed in the description. But after replacing the 2.5mm bolts and nuts with something more suitable, this cooler works great. I had a CM4 with this and a 4010 Noctua fan on top and the CPU overclocked to 2147MHz in 24 hours and couldn't get past 40C.

Perfect fit and a good large mass for heat transfer. However, as the title says, if you follow the compilation in the product image description, these screws are too short to go through the heatsink/CM4/motherboard - however, if you reverse the screws so that the head of the screw is at the bottom the CM4 board and the nut on top of the heatsink they fit perfectly although unfortunately they don't look good. Also, don't over-tighten the bolts/nuts, there is some room under the legs and if you…

The heatsink I received is properly attached and touches both chips with only one layer of thermally conductive foam. (It was included in addition, be sure to remove the insulating plastic). I'm deducting a star because the included screws are only long enough to attach the heatsink to the CM4 module and not long enough to go through the CM4 base I/O carrier. So if you want the CM4 board to be more securely attached to the CM4 IO, you will need longer screws. Maybe it doesn't matter much since…