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Hardware Reference Guide 1–9
Hardware Upgrades
identical. Therefore, if you have one preinstalled DIMM in socket
J23 and are adding a second DIMM, it is recommended that you
install an identical DIMM into the J25 socket. If you are
populating all four DIMM sockets, use identical DIMMs in each
socket. Otherwise, the system will not operate in dual channel
mode.
There are two DIMM sockets on the HP Compaq d228 and d230
Microtower system board, operating in single-channel mode.
There are four DIMM sockets on the HP Compaq d248 Microtower
system board, operating in either single- or dual-channel mode, with
two sockets per channel. The sockets are labeled J23, J24, J25, and
J28. Sockets J23 and J24 operate in memory channel A. Sockets J25
and J28 operate in memory channel B.
Installing Memory Modules
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CAUTION: The memory module sockets have gold metal contacts. When
upgrading the memory, it is important to use memory modules with gold
metal contacts to prevent corrosion and/or oxidation resulting from having
incompatible metals in contact with each other.
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CAUTION: Static electricity can damage the electronic components of
the computer or optional cards. Before beginning these procedures,
ensure that you are discharged of static electricity by briefly touching a
grounded metal object. Refer to Chapter 5 for more information.
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CAUTION: When handling a memory module, be careful not to touch
any of the contacts. Doing so may damage the module.
1. Turn off the computer properly through the operating system and
turn off any external devices.
2. Disconnect the power cord from the power outlet and the
computer, and disconnect any external devices.
✎
If there is a hard drive in bay 5 it will be necessary to remove the
lower drive cage before removing the memory modules.
3. Remove the right access panel.