Installing Additional Memory; Dimms - Compaq 239158-999 - Mini Tower - Power Supply 250 Watt Hardware Reference Manual

Installing Additional Memory

DIMMs

Hardware Reference Guide
The computer comes with synchronous dynamic random access
memory SDRAM) dual inline memory modules (DIMMs).
The memory sockets on the Intel 845 chipset-based system board can
be populated with industry-standard 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.
For proper system operation, the DIMMs must be industry-standard
168-pin, unbuffered PC133-compliant SDRAM DIMMs, depending
on the model. The SDRAM DIMMs must support CAS Latency 2
or 3 (CL = 2 or CL = 3). They must also contain the mandatory Joint
Electronic Device Engineering Council (JEDEC) Serial Presence
Detect (SPD) information. DIMMs constructed with x4 SDRAM are
not supported; the system will not start using unsupported DIMMs.
CAUTION: Some models support ECC memory and some support
non-ECC memory. For those systems that do support ECC, Compaq
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 2 long beeps. In addition, the system will not
boot the operating system.
Hardware Upgrades
2-7