This is first vapor chamber low profile air cooler to our knowledge and while it did not beat the AXP90-X47 FC in our thermal testing, it performed reasonably well all things considered. The C5's accessories packaging design was a nice touch and well thought out. Unfortunately, I can not speak the same of the included fan in both its odd design and its noise output as 3200RPM.

Unfortunately, it did not quite live up to expectations on AM5 with high of 88°C for C5 CU, compared to 82°C for AXP90-X47 FC. I cannot comment on cooling performance on Intel platforms, which sometimes differ. You can find our full low profile benchmark charts here to see where the C5 roughly fits in.

On brighter note you can attach an NF-A9x14 or other slim 90mm fan to C5 heatsink bringing total height to around 44~45mm which some users may find useful. You will have to get little creative with attaching 3rd party fans to the C5 heatsink as it does not support standard fan mounting.

Overall I'm not sure what to make of the C5 coolers as they do not move the needle in terms of thermal performance compared to best low profile air coolers currently available.