HP Netserver E 60, LC 3, LH 3/3r, and LPr Processor Upgrade Guide

Chapter 4 Installation in E 60 and LPr
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CAUTION If the NetServer has only one processor module, it must be
installed in the primary processor position, and a terminator
board must be installed in the secondary processor position.
If you add a second processor, leave the original processor in
the primary position, and add the new processor to the
secondary position.
Installing a VRM in HP NetServer LPr
NOTE The HP NetServer E 60 does not require installation of voltage
regulator modules (VRMs).
One voltage regulator module (VRM) must be installed for each processor
module installed in an HP NetServer LPr. If you are adding a second processor
module to an HP NetServer LPr, install a VRM in the secondary VRM socket,
next to the secondary processor module.