beautypg.com

2 memory configurations – Intel AX965Q User Manual

Page 25

background image

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.