System Board; Installing Additional Memory - HP xw4000 Hardware Reference Manual

Installing Additional Memory

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Hardware Reference Guide
Your computer comes with double data rate (DDR) DIMMs.
The memory sockets on the Intel 845 chipset-based system board
can be populated with industry-standard DDR DIMMs. These
memory module slots are populated with at least one preinstalled
memory module. To achieve the maximum memory support, you
may be required to replace the preinstalled DIMM with a higher
capacity DIMM.
CAUTION: Some models support ECC memory and some support
non-ECC memory. For those systems that do support ECC, HP does not
support mixing ECC and non-ECC memory. Doing so will cause the system
to blink the NUMLOCK LED on the keyboard continuously and, if a
speaker is installed in the system, there will be a short beep followed by
two long beeps. In addition, the system will not boot the operating system.
For proper system operation, your DDR DIMMs must be
industry-standard 184-pin, unbuffered PC 1600 200 Mhz- or PC2100
266 Mhz-compliant DDR DIMMs. The DDR DIMMs must support
CAS Latency 2 or 2.5 (CL = 2 or CL = 2.5). They must also contain
the mandatory JEDEC SPD information. Also, x16 (double-sided)
and x4 DIMMs are not supported. The system will not start using
unsupported DIMMs. The largest memory supported is 2 GB using
two 1 GB memory modules.
Hardware Upgrades
2–7