User`s manual

32 Getting Started
3.3 System Memory
The M-322 supports up to 8 GB of DDR2 667/800 MHz memory
modules in four DIMM sockets. DDR2 modules are notched to
facilitate correct installation in the DIMM sockets. See Figure 1-2
on page 9 for DIMM socket locations.
Memory Configurations
Dual channel configuration is supported by the M-322 as follows:
Channel A: DIMM_A1 and DIMM_A2
Channel B: DIMM_B1 and DIMM_B2
Unbuffered non-ECC DDR2 DIMMs with capacities of 256 MB,
512 MB, 1 GB and 2GB can be installed into the DIMM sockets as
follows:
X Memory modules of varying sizes may be installed in Channel
A and Channel B. The system maps the total size of the chan-
nel with the lowest capacity for dual-channel configuration. Any
excess memory from the channel with higher capacity is then
mapped for single-channel operation.
X Always install DIMMs with the same CAS latency. For optimum
compatibility, it is recommended that you obtain memory mod-
ules from the same vendor.
X Due to chipset resource allocation, the system may detect less
than 4 GB system memory when four 1 GB DDR2 memory
modules are installed. This limitation occurs in Windows® XP
32-bit operation system, which does not support Physical
Address Extension (PAE).
X The M-302 does not support memory modules with 128 Mb
chips or double-sided x16 memory modules.
Memory Module Installation
The DDR2 memory modules are notched to facilitate correct
installation in the DIMM sockets.
WARNING:
Disconnect all power supply to the board before installing a
memory module to prevent damaging the board and mem-
ory module .