Asrock C2750d4i (or C2550d4i) CPU Cooler Fan Shroud

thingiverse

I am sharing this information with no guarantees or warranties, so please use it at your own risk. The Asrock C2750D4i and C2550D4i motherboards are known for having heat issues that can lead to system failures, as seen in forums like the one here: https://forums.freenas.org/index.php?threads/asrock-rack-c2750d4i-cpu-temperature-issue.41528/. This problem is exacerbated by the passive-only cooling provided with these motherboards. I've been monitoring my C2750D4I CPU temps for a while now and was concerned about how hot it gets, so I decided to design and 3D print a fan mount that fits over the default CPU heatsink and allows a 90mm cooling fan to be mounted. The design of this part was driven by the size and shape of my case, which is a Silverstone DS380. This is why the fan is offset and the overall profile of the mount is quite low. I've included cutouts for M4 nuts (to take the M4 bolts that secure the mount to the heatsink). To fit these nuts into place, simply screw them onto a threaded bolt, heat them with a lighter or candle while holding the other end with pliers, and gently push the nut into the part's cutout. This creates a very snug fit. Then, just attach a 90mm fan to one end and bolt the other end onto the heatsink. I've been really impressed with the results. Before installing the adaptor, my CPU temps were at 40oC idle and 60oC under load (generated by transcoding a x265 HVEC file in emby). After fitting the fan, these temps dropped to 28oC and 41oC respectively, using exactly the same benchmarks.