Upgrading Memory - HP Deskpro EN Supplementary Manual

Upgrading Memory

When you install an expansion board, make sure you
press firmly on the board so that the whole connector
seats properly in the expansion board slot.
8. Reinstall the screw to secure the board.
The computer comes with synchronous dynamic random access
memory (SDRAM) dual inline memory modules (DIMMs)
installed and supports up to 256 MB of memory. The memory
sockets on the system board can be populated with 8-, 16-, 32-,
64-, or 128-MB DIMMs. Self-refresh DIMMs are required.
For proper system operation, the DIMMs must be industry
standard 168-pin, 100-MHz or faster, unbuffered SDRAM
DIMMs. The SDRAM DIMMs must support CAS Latency 2 or
3 (CL = 2 or CL = 3). They must also contain the mandatory
Joint Electronic Device Engineering Council (JEDEC) Serial
Presence Detect (SPD) information. DIMMs constructed with
x4 SDRAM are not supported; the system will not start using
unsupported DIMMs.
If your system processor has a bus speed of 66 MHz, Compaq
recommends that any additional DIMMs also be 66 MHz. If the
system bus speed is 100 MHz, the use of 100-MHz DIMMs is
required. On the Compaq Deskpro EN Series Personal
Computer, Small Form Factor and Net PC models, processors
with speeds of 266 to 333 MHz have bus speeds of 66 MHz;
processors with speeds of 350 MHz or higher have bus speeds
of 100 MHz. You can also run Compaq Computer Setup to
determine your system bus speed. See the Software Reference
Guide for instructions.
The computer can accept standard DIMMs or Error
Checking and Correcting (ECC) DIMMs or a
combination of both. See the Software Reference Guide
for more information about using ECC DIMMs.
Guide to Features & Upgrades 3-11