User Service Guide, Third Edition - HP Integrity cx2620 Server

Figure 6-38 Lift Processor Module and Turbo Fan Straight Up
15. Place the turbo fan heatsink upside down to ensure the pins do not get bent.
Replacing a Single-core Processor
The system board can support either one or two processors. The following procedure is applicable
to installation of processor 0 or processor 1. Processor 0 (CPU 0) is located closer to the chassis
side panel and processor 1 (CPU 1) is located closer to the DIMM sockets. You must install
processor 0 before installing processor 1. Proceed as follows:
Removing and Replacing a Single-Core System Processor 199