3 System upgrades48Upgrading the processorProcessor configuration guidelinesThe server supports two LGA 1366 processor sockets supporting dual-core or quad-core Intel Xeon processors. The supplied processors maybe upgraded or additional processors installed.Observe the following guidelines when replacing or installing aprocessor.• Processor 1 socket must always be populated. If no processor isinstalled in this socket, the system will fail to boot.• Before removing a processor, make sure to back up all importantsystem files.• When installing a second processor, make sure it has samestepping and frequency specifications as the default processor.• Handle the processor and the heat sink carefully. Damage to eithermay prevent the system from functioning properly.Replacing the processorWarning! The processor becomes very hot when the system is on.Allow it to cool off first before handling.(1) Remove the heatsink (see “Removing the heatsink” onpage page 45).(2) Release then lift the load lever.(3) Open the retention plate to expose the socket body.