HP Pavilion a387x Desktop PC - Manual (Page 133)

upgrading and servicing the pc (2) 125
adding memory
The motherboard contains sockets for either DIMMs (dual in-line memory
modules), or DDR DIMMs (double data rate dual in-line memory modules),
depending on which PC model you have.
To determine which type of memory module your PC uses, and for specific
memory module information and specification, go to the Web site listed in your
Warranty and Support Guide and click the Support link.
The motherboard contains 168-pin DIMM sockets or 184-pin DDR DIMM
sockets. The exact number of sockets depends on which model you have.
DIMM
DDR DIMM
WARNING: Using the wrong type of memory module could damage
the system.
dimms
DIMMs must be 168-pin unbuffered SDRAM (synchronous dynamic random
access memory), compliant with the Intel
® PC SDRAM Unbuffered DIMM
Specification. The PC ships with one or more memory modules, but you can
replace the existing memory module(s) with higher-capacity ones. You can
install 64 MB, 128 MB, 256 MB, or 512 MB memory modules in the computer.
NOTE: 256 MB configurations vary depending on your computer model. 256 MB
and 512 MB DIMM memory modules are not compatible with all computer
models.