Asrock C2750d4i (or C2550d4i) CPU Cooler Fan Shroud

thingiverse

DISCLAIMER up front - I am offering the following purely with the view of information sharing and take no responsibility for any harm that may occur to people systems as a result. The Asrock C2750D4i and C2550D4i motherboards are fairly well documented to have heat issues (which have resulted system failures) - for example see here: https://forums.freenas.org/index.php?threads/asrock-rack-c2750d4i-cpu-temperature-issue.41528/ This situation is certainly not helped by the passive-only cooling that ships with the motherboards. I have long monitored my C2750D4I CPU temps and worried about how hot it gets. I decided to design and print a fan mount that fits over the default CPU heatsink and allows a 90mm cooling fan to be mounted. The design of the part was driven by the size and shape of my case (Silverstone DS380) - which is why the fan is offset and the overall profile of the mount is quite low. I have designed cutouts to insert M4 nuts (to take the M4 bolts that lock the mount onto the heatsink). To fit the nuts into place, simple screw the nuts onto a very end of a threaded bolt, heat with a lighter or candle (while holding the other end with pliers) and gently push the nut onto the part cutout. This forms a very nice snug fit. Then you just need to fit a 90mm fan to one end and bolt the other end onto the heatsink. I've been really impressed with the results. Prior to fitting the adaptor, my CPU temps were 40oC at idle and 60oC under load (generated by transcoding a x265 HVEC file in emby). After fitting the fan these temps droped to 28oC and 41oC respectively (using exactly the same benchmarks).