What is the difference between LGA20xx Narrow ILM and LGA20xx Square ILM?

There are two different types of ILM (Independent Loading Mechanism) for Intel’s LGA20xx based Xeon CPUs: Square ILM with 80x80mm hole spacing and Narrow ILM with 56x94mm hole spacing.

Illustration showing Square and Narrow ILM for LGA2011 socket. Sqaure ILM has the mounting points centered around the CPU socket with 80mm spacing horizontally and vertically; Narrow ILM has 56mm horizontal and 94mm vertical spacing and the mounting points sit above and below the CPU

The mounting system of the NH-U12DX i4/NH-D9DX i4 3U/NH-U9DX i4 is fully compatible with both types out of the box.

Can I make my cooler compatible with LGA20xx Narrow ILM?

These coolers can be made compatible with LGA20xx Narrow ILM with additional mounting parts:

The additional mounting parts needed can be requested free-of-charge via this order form on our website.

You've sent me additional mounting parts, how do I install my cooler on Narrow ILM?

For installation guidance, you can refer to the steps for Narrow ILM in the manual of the NH-U12DX i4.