NEC 320Lb-R manual Replacing or Adding DIMMs

Replacing or Adding DIMMs

The following subsections provide the procedures for configuring and upgrading system memory. Use these procedures when replacing or adding dual inline memory modules (DIMMs) to your system. When adding or changing memory in a CPU module the same changes must be must be made to the other CPU module to provide total system redundancy and mirroring.

The CPU board contains six DIMM sockets (see Figure 4-18). DIMMs should be installed in the six sockets starting from the lowest number (DIMM #1) to the highest number (DIMM #6). Each 168-pin socket can hold a single 72-bit DIMM module with 128MB, 256MB or 512MB of memory. DIMMS must be installed in pairs of the same memory capacity (i.e., three groups of two DIMMs each.)

Note: When replacing or upgrading DIMMs the replacement DIMMs must be of the same specifications of all the installed DIMMs.

!CAUTION

Electrostatic discharge (ESD) can damage components; place them on an antistatic surface. Add or replace DIMMs on the CPU board using an antistatic wrist strap attached to chassis ground.

CPU #2

CPU #1

ADIMM #1

BDIMM #2

CDIMM #3

DDIMM #4

EDIMM #5

FDIMM #6

A	Group 1
B
C	Group 2
D
E	Group 3
F

Figure 4-18. DIMM Component Layout

CRU Replacement and Server Upgrades 4-19