ASUS E2938 User Manual

ASUS Commando

2-15

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.

•  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.

Windows 2000 Advanced Server

Windows XP Professional x64 Edition