Noctua NH-D9 DX-3647 4U

The Noctua NH-D9 is a high-end heatsink and fan cooling system, featuring a pair of in-line 92mm fans. By using smaller fans than the big 120 and 140mm designs, this cooler is able to fit in slim tower and 4U rackmount chassis. As with all Noctua models, it provides excellent cooling with quiet operation - though in a rackmount chassis there will likely be other sources of noise regardless of how quiet the CPU cooler is.

This particular variant, the NH-D9 DX-3647 4U, is specifically designed to fit Intel LGA 3647 socket processors like the Xeon Scalable and Xeon W-3200 series.