HP D5970A - NetServer - LCII Guía Del Usuario page 52

Chapter 6
The processors must operate at the designated speed stated by the product
type on the processor.
Use only processor upgrade kits with the same HP product number.
This ensures the processor type, clock speed, and cache size are the same.
Ensure a processor is installed in the primary processor (CPU 1) socket
before installing a processor in the secondary socket (CPU 2).
Primary Processor (CPU 1)
46
Installing an Additional Processor
System Board (top view)
Figure 6-1. System Board
Secondary
Processor
(CPU 2)