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.

•When installing total memory of 4GB capacity or more, Windows 32-bit operation system may only recognize less than 3GB. Hence, a total installed memory of less than 3GB is recommended.

•If you install Windows® XP 32-bit operation system, a total memory of less than 3GB is recommended.

•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

4 GB on the operating systems listed below. You may install a maximum of 2 GB DIMMs on each slot, but only DDR2-800 and DDR2-667 2 GB density modules are available for this configuration.

32-bit64-bit

Windows® XP

Windows® XP x 64 Edition

Windows® Vista

Windows® Vista x 64 Edition

•Some old-version DDR2-800 DIMMs may not match Intel® On-Die-Termination (ODT) requirement and will automatically downgrade to run at DDR-667. If this heppens, contact your memory vendor to check to ODT value.

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Chapter 1: Product introduction