System Memory; Overview; Memory Configurations - Asus P5B DELUXE User Manual

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 figure illustrates the location of the DDR2 DIMM sockets:
P5B Deluxe 240-pin DDR2 DIMM sockets
Channel
Channel A
Channel B
2.4.2

Memory configurations

You may install 256 MB, 512 MB, 1 GB, and 2 GB unbuffered non-ECC DDR2
DIMMs into the DIMM sockets.
• You may install varying memory sizes in Channel A and Channel B. The
system maps the total size of the lower-sized channel for the dual-channel
configuration. Any excess memory from the higher-sized channel is then
mapped for single-channel operation.
• Always install DIMMs with the same CAS latency. For optimum
compatibility, it is recommended that you obtain memory modules from the
same vendor.
• Due to chipset resource allocation, the system may detect less than 8 GB
system memory when you installed four 2 GB DDR2 memory modules.
• This motherboard does not support memory modules made up of 128 Mb
chips or double sided x16 memory modules.
ASUS P5B Deluxe
Sockets
DIMM_A1 and DIMM_A2
DIMM_B1 and DIMM_B2
-1