1.7.2Memory 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.

•If you install four 1 GB memory modules, the system may detect less than 3GB because the address allocation for other critical functions. This limitation applies to Windows® Vista 32-bit/ Windows® XP 32-bit version operation system since it does not support Physical Address Extension (PAE) mode.

•This motherboard does not support memory modules made up of 128 Mb chips or double sided x16 memory modules.

Notes on memory limitations

• 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.

64-bit

Windows XP Professional x64 Edition

Windows Vista Professional x64 Edition

•Some old-version DDR2-800 DIMMs may not match Intel®

On‑Die‑Termination (ODT) requirement and will automatically downgrade to run at DDR2-667. If this happens, contact your memory vendor to check the ODT value.

•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.

•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.

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Chapter 1: Product introduction