Noctua NH-U9DX i4, Premium CPU Cooler for Intel Xeon LGA20xx (Brown)

This fit great in my 4U server. Temps are pretty good and its really quiet. Its hard to find a cooler that is short enough to fit but this one worked perfectly.

I have a dual Xeon E5-2697V2 (LGA2011 sockets) SuperMicro X9DRi-F motherboard that has Narrow ILM mount points for a cooler/heatsink. The motherboard is inside a 4U SC846E16-R1200B SuperMicro chassis.The original hardware had low profile heatsinks without attached fans and an air shroud. There were some really loud fans that would work well enough to push air through the server and keep the CPUs cool. I replaced all the case fans with Noctua 80mm fans to lower the noise, but they just didn't push enough air to cool the CPUs and it would overheat with enough load.Now that I've replaced the old heat sinks (and removed the air shroud) with these coolers, the whole server stays cool (I couldn't get it to overheat with 90% CPU use) and quiet. These coolers fit in my 4U chassis with room to spare, and they came with Narrow ILM mounts that just needed to be swapped with the installed square ones. My chassis needs air to be pushed towards the back of the server, and the included brackets have ones that allow either orientation depending on your needs.

Doesn't screw down exactly right (screws too short) but once installed it significantly brought my CPU temp down and I mean by tens of degrees. In the Dell Precision 5810, the included screws are too short to use the proper springs, so I needed to substitute 3 #10 lock washers in place of each spring. Dell also uses some sort of proprietary fan socket for which I needed an adapter cable (search "CRJ Latching 5-pin female pwm pc fan adapter cable for dell motherboards" on Amazon) . Also with this replacement heat sink, the memory ventilation shrouds no longer fit but that doesn't seem to be an issue in itself. It's just that this upgrade is bigger than the original heat sink. Probably don't need those shrouds anyway, but I might be tempted to "adjust" them with a Dremel tool if I feel ambitious some day.

Okay so I have the Asrock X99E-ITX/AC motherboard. That crazy little mini ITX X99 motherboard with a narrow ILM mounting system. Now this is the third cooler I've tried. First was a Cooler Master Seidon 120v since the motherboard came with an adapter bracket specifically for that. That worked, but in my case (Ncase M1), it was a bit cramped and on top of that, the pump noise was awful. The case itself has nearly no noise dampening since it's so small. So I changed to a 2U server copper heatsink with a fan attached. That was quiet, but under load, my Xeon was getting a little toastier than I'd liked. Then I came across this one on Amazon. I didn't think it would fit, but I ordered it anyway. It fit perfect. There is very little room to the other side of the case, but it isn't touching and I could still put both fans on it and it blows directly out of the case. Most importantly, it keeps my temps under 60c while gaming and below 75 while stress testing while being extremely quiet. I'll definitely be buying Noctua coolers for future builds. This one checks all the boxes.