This product is either discontinued or we cannot get that from suppliers.
Noctua U12DXi4, Socket Compatibility LGA 1356 (Socket B2), LGA 2011 (Socket R), 1500RPM, Air Flow 93.4 m³/h, Max Noise Level 22.4dBA, Fan Size 120mm.
Noctua’s DX line of coolers has become a default choice in high performance quiet cooling solutions for Intel Xeon CPUs. The latest i4 revision supports LGA2011 (both Square ILM and Narrow ILM), LGA1356 and LGA1366 based Xeon platforms.