Asus P5B-VM SE User Manual download pdf (Page 29)

ASUS P5B-VM SE 1-17

• 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

conguration. 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 or 2GB 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 32-bit operation system

which does not support Physical Address Extension (PAE).

• 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

8 GB on the operating systems listed below.

32-bit 64-bit

Windows

2000 Advanced Server 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. There will be 8MB reduction in total

memory when enabling ASUS Thermostat function under Single Channel

mode, and 16MB reduction under Dual Channel Mode.

• 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 Intel® Quiet System Technology.

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Asus P5B-VM SE User Manual Page 29