User’s Manual
ATX Main board
25
1.5.2 Memory Configurations
You may install 256 MB, 512 MB, 1 GB and 2GB unbuffered non‑ECC DDR2 DIMMs into
the DIMM sockets using the memory configurations in this section.
z 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.
z Always install DIMMs with the same CAS latency. For optimum
compatibility, it is recommended that you obtain memory modules
from the same vendor.
z 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 limitation appears on Windows® XP
32-bit operation system which does not support Physical Address
Extension (PAE).
z If you install Windows® XP 32-bit operation system, a total
memory of less than 3GB is recommended.
z This motherboard does not support memory modules made up of
128 Mb chips or double-sided x16 memory modules.
Notes on memory limitations
z Due to chipset limitation, this motherboard can only support up to
8 GB on the operating systems listed below. You may install a
maximum of 2 GB DIMMs on each slot, but only DDR2-533 and
DDR2-667 2 GB density modules are available for this
configuration.
32-bit 64-bit
Windows 2000 Advanced Server Windows XP Professional x64 Ed.
z Some old-version DDR2-800/667 DIMMs may not match Intel®’s
On‑Die‑Termination (ODT) requirement and will automatically
downgrade to run at DDR2-533. If this happens, contact your
memory vendor to check the ODT value.
z Due to chipset limitation, DDR2-800 with CL=4 will be
downgraded to run at DDR2-667 by default setting. If you want to
operate with lower latency, adjust the memory timing manually.
z Due to chipset limitation, DDR2-667 with CL=3 will be
downgraded to run at DDR2-533 by default setting. If you want to
operate with lower latency, adjust the memory timing manually.
z The total memory may has 8MB reduction under Single Channel
mode, and 16MB reduction under Dual Channel mode because
the address space is reserved for the Intel® vPro™ Technology
and the Intel® Quiet System Technology.
