1–8 Hardware Reference Guide
Hardware Upgrades
Maximum operating speed is determined by a combination of the
CPU and type of memory used. Refer to the table below for the
optimum combination.
✎
The system will not start if you install unsupported DIMMs.
Single and Dual Channel Modes
HP Compaq dx2000 Microtower models will automatically operate in
single channel mode or a higher-performing dual channel mode,
depending on how the DIMMs are installed.
■ In single channel mode, the maximum operational speed is
determined by the slowest DIMM in the system. For example, if
the system is populated with a DIMM that is 266 MHz and a
second DIMM that is 333 MHz, the system will run at the slower
of the two speeds.
■ In dual channel mode, all DIMMs must be identically matched.
DIMMs in the J23 and J24 sockets must be identical; DIMMs in
the J25 and J28 sockets must also be 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.
Maximum Front Side Bus Operating Speed (MHz)
CPU Front Side Bus
(MHz)
DDR266
DIMM
DDR333
DIMM
DDR400
DIMM
400 266 266 266
533 266 333 333
800 266 320 400
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