Compaq 247320-003 - Deskpro 4000 - 5166 Model 2500/CDS Reference Manual page 134

You can expand computer memory by installing industry
standard, 168-pin synchronous DRAM dual inline memory
modules (DIMMs). For proper system operation, use 66MHz or
faster unbuffered DIMMs. DIMM upgrade kits are available as
options from Compaq.
The system board has three memory module slots. However,
one or more of these memory module slots is used to hold the
standard 16- or 32-megabyte memory module(s). You must
replace the preinstalled memory module(s) with a 128-megabyte
memory module to achieve maximum memory of 384
megabytes.
For further reference, memory module installation instructions
are indicated on the system board.
To install a memory module, complete the following steps:
1. If you have locked the Smart Cover Lock, use Computer
Setup to unlock the lock.
For more information about Computer Setup, refer to
Chapter 8, "Using Compaq Utilities."
2. Turn off the computer, disconnect the power cord from the
electrical outlet, remove the side panel, and turn the
computer on its side.
3. Remove the expansion board cage and locate the DIMM
sockets.