Adding System Memory - HP Deskpro 1000 Reference Manual

Adding System
Memory
The computer comes with 16 megabytes of single inline memory
modules (SIMMs) or dual inline memory modules (DIMMS)
installed. System memory may be upgraded by adding either
additional SIMM modules or additional DIMM modules.
Compaq strongly recommends not combining DIMMs
and SIMMs.
The four SIMM memory sockets on the system board can be
populated with 8-, 16-, 32-, or 64-megabyte SIMMs. The system
supports up to 256 MB of SIMM memory. SIMMs must be
installed in equally matched pairs; for example, two 8-MB
modules, two 16-MB modules, two 32-MB modules, or two
64-MB modules. If you are mixing extended data out (EDO)
and fast page mode (FPM) DRAM, identical modules must be
installed two at a time, for example, two EDO modules of the
same type, speed, and size; or two FPM DRAM modules of the
same type, speed, and size.
The two DIMM memory sockets on the system board can be
populated with 8-, 16-, 32-, 64-, or 128-MB DIMMs. The
system supports up to 256 MB of DIMM memory. You may
install DIMMs one at a time, but when installing pairs each
module in the pair must be of equal size. For proper system
operation, the DIMMs must be industry standard 168-pin,
66-MHz or faster unbuffered synchronous dynamic random
access memory (SDRAM) DIMMs, or unbuffered EDO
DIMMs. For EDO DIMMs, memory configuration is ×4, ×8,
or ×16. For SDRAM DIMMs, memory configuration is ×8
or ×16; ×4 configuration is not supported. The system will not
start if you use unsupported DIMMs.
Reference Guide 5-3