Computer Hardware User Manual

2-14 Chapter 2: Hardware information
2.4 System memory
2.4.1 Overview
The motherboard comes with four Double Data Rate 2 (DDR2) Dual Inline
Memory Modules (DIMM) sockets.
A DDR2 module has the same physical dimensions as a DDR DIMM but has
a 240-pin footprint compared to the 184-pin DDR DIMM. DDR2 DIMMs are
notched differently to prevent installation on a DDR DIMM socket.
The gure illustrates the location of the DDR2 DIMM sockets:
2.4.2 Memory configurations
You may install 256 MB, 512 MB and 1 GB unbuffered non-ECC DDR2
DIMMs into the DIMM sockets.
• For dual‑channel conguration, the total size of memory module(s)
installed per channel must be the same (DIMM_A1 + DIMM_A2 =
DIMM_B1 + DIMM_B2).
• Always install DIMMs with the same CAS latency. For optimum
compatibility, it is recommended that you obtain memory modules
from the same vendor. Refer to the DDR2 Qualied Vendors List on
the next page for details.
• Due to chipset resource allocation, the system may detect less than
4 GB system memory when you installed four 1 GB DDR2 memory
modules.
• This motherboard does not support memory modules made up of
128 Mb chips or double sided x16 memory modules.
Chan nel Soc kets
Channel A DIMM_A1 and DIMM_A2
Channel B DIMM_B1 and DIMM_B2
P5LD2 SE 240-pin DDR2 DIMM Sockets
DIMM_A2 DIMM_A1 DIMM_B2 DIMM_B1
112 pins
128 pins
Below:Mic In
Center:Line Out
Top:Line In
R
P5LD2 SE