Single And Dual Channel Modes - HP Compaq dx2000 MT Hardware Reference Manual

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Single and Dual Channel Modes

1–8
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.
Maximum Front Side Bus Operating Speed (MHz)
CPU Front Side Bus
(MHz)
400
533
800
The system will not start if you install unsupported DIMMs.
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.
DDR266 DDR333
DIMM DIMM
266 266
266 333
266 320
Hardware Reference Guide
DDR400
DIMM
266
333
400