Technical data

Parts Replacement
5-36
Installing Additional Computer Memory
The computer supports 168-pin DIMM memory modules utilizing Synchronous
Dynamic Random Access Memory (SDRAM) technology. SDRAMs operate at
speeds of 66 MHz (or greater) over a local memory bus, which is much faster than
SIMMs using ECC or EDO memory.
Depending on the model you ordered, your computer came with either 16 MB,
32 MB, or 64 MB of computer memory. Adding more memory enables the computer
to run larger, more complicated software and run it more quickly. DIMMs are
available in 16 MB, 32 MB, 64 MB, and 128 MB memory module sizes to expand
computer memory up to 384 MB. Use only DIGITAL qualified memory modules for
optimal operation.
Contact the local DIGITAL sales representative for ordering information.
Computer memory is installed using the three DIMM sockets located on the main
logic board as shown in Figure 5-13. All three DIMM sockets (J18, J19, and J20)
accept single or dual bank DIMMs.
When adding memory make sure to reference the memory configuration table and
follow these memory expansion guidelines:
•
Install 168-pin DIMMs using 66 MHz (or faster), 64-bit SDRAMs.
NOTE:
Install DIMMs supplied by Digital Equipment Corporation
and qualified vendors. DIGITAL does not support computer
performance, product warranty, or service calls resulting from
installation of non-qualified DIMMs.
•
Single bank DIMMs are available in 16 MB and 64 MB memory modules.
Single bank DIMMs have components to provide one 64-bit wide memory
access.
•
Dual bank DIMMs are available in 32 MB and 128 MB memory modules.
Dual bank DIMMs have two sets of components, each providing 64 bits
(ECC DIMMS are 72 bits wide).