Why would Xeons need different cooling unless you're setting up a dual CPU server?
They wouldn't, but this site isn't just for gaming PC enthusiasts.
no server will need this since they are stored away in a dedicated, temperature controlled room. why pay a ton for a cooler when the stock one works just fine?
Plenty of people have DP systems in their workspace. While most are going to choose a workstation board which use square ILMs, some will go for server boards due to cost, features and smaller footprint. Noctua are responding to demand for something here.