CPU Type: Build in Intel® Socket 2011-3: Square type (80x80mm; The maximum length of the heatsink screw thread is 3.7mm.) Processors; Intel® Socket 2011-v3 for Intel® Xeon® processor E5-1600 v4 product family; Intel® Socket 2011-v3 for Intel® Xeon® processor E5-2600 v4 product family