ASUS P5K SE Manuale Utente

2-14

Chapter 2: Hardware information

You may install 256 MB, 512 MB, 1 GB, and 2 GB unbuffered non-ECC DDR2 

DIMMs into the DIMM sockets.
Recommended Memory Configurations

•  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 only recognize less 

than 3GB because the address space is reserved for other critical functions. 

This limitation appears on Windows

®

 XP/Vista 32-bit operation system which 

does not support Physical Address Extension (PAE).

•  If you install Windows

®

 XP/Vista 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.

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Windows

®

 XP Professional x64 Edition

Windows

®

 Vista x64 Edition

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.

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

®

’s 

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.