2–12 www.hp.com Hardware Reference Guide
Hardware Upgrades
Refer to the Computer Setup (F10) Utility Guide on the
Documentation CD for information on how to determine the
processor bus frequency of a specific computer.
DIMM Sockets
The system will automatically operate in single channel mode, dual
channel Asymmetric mode, or a higher-performing dual channel
Interleaved mode, depending on how the DIMMs are installed.
■ The system will operate in a single channel mode if the DIMM
sockets are populated in one channel only.
■ The system will operate in dual channel Asymmetric mode if the
total memory capacity of the DIMMs in Channel A is not equal to
the total memory capacity of DIMMs in Channel B.
■ The system will operate in a higher-performing dual channel
Interleaved mode if the total memory capacity of the DIMMs in
Channel A is equal to the total memory capacity of the DIMMs in
Channel B. However, the technology and device width can vary
between the channels. For example, if Channel A is populated
with one 512-MB DIMM and Channel B is populated with two
256-MB DIMMs, the system will operate in Interleaved mode.
■ In any mode, the maximum operating speed will be determined
by the slowest DIMM in the system. For example, if the system is
populated with a 333-MHz DIMM and a 400-MHz DIMM, the
system will run at only 333 MHz. For maximum performance
improvement, install identical high-performance DIMMs.
There are three DIMM sockets on the system board, with one socket
in memory Channel A and two sockets in memory Channel B. The
sockets are labeled XMM1, XMM3, and XMM4. Socket XMM1
operates in memory Channel A; sockets XMM3 and XMM4 operate
in memory Channel B.
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