Asus E2938 manual Memory configurations, 64-bit

2.4.2Memory 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.

•Due to chipset resource allocation, the system may detect less than 8 GB system memory when you installed four 2 GB DDR2 memory modules.

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

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

•If you install Windows XP 32-bit version operating system, we recommend that you install less than 3GB of total memory.

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.

32-bit

Windows 2000 Advanced Server

64-bit

Windows XP Professional x64 Edition

•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.

•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.

•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.

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