Intel 5100 Series Instruction Manual page 12

Thermal/Mechanical Reference Design
height of the processor in the socket is shown in Appendix A. The drawing is
superseded with the drawing in the processor Datasheet, should there be any conflicts.
Integrated package/socket stackup height information is provided in the LGA771
Socket Mechanical Design Guide.
12 Dual-Core Intel® Xeon® Processor 5100 Series Thermal/Mechanical Design Guide