NEC HX4500 Service & Reference Manual page 90

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Note:
processors must be matched for speed. If replacing a processor, the
replacement processor must match the speed of all installed
processors. If upgrading a processor, all processors must be
upgraded to match.
Electrostatic discharge (ESD) can damage components; place them
on an antistatic surface. Update the CPU baseboard using an
antistatic wrist strap attached to chassis ground.
4-18 Assembly and Disassembly Procedures
Your system may have up to four processors. All installed
! CAUTION