"The Noctua NH-D9DXi4-3U is a mid-sized heatsink designed specifically for lower noise cooling of Intel Xeon processors in 3U height computer/server chassis. It's compact stature makes it ideal for rack mounted computers in a recording studio, video editing suite, operations control center, office environment or anywhere Xeon-based computers have typically had to be relegated to the 42U rack. The NH-D9DXi4-3U heatsink stands 111mm tall and has a footprint of just 95mm square, ensuring it won't overhang adjacent memory slots or interfere with PCI Express cards. "
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