Memory Configurations - Asus P5Q WS User Manual

2.4.2

Memory configurations

You may install 256 MB, 512 MB, 1 GB, and 2 GB non-ECC, unbuffered, DDR2
DIMMs into the DIMM sockets.
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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.
It is recommended to install the memory modules from the yellow slots for
better overclocking capability.
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
system which does not support Physical Address Extension (PAE).
If you install Windows
less than 3GB is recommended.
This motherboard does not support memory modules made up of 128 Mb
chips.
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.
64-bit
Windows ® XP Professional x64 Edition
Vista x64 Edition
Windows
®
The default memory operation frequency is dependent on its SPD. Under
the default state, some memory modules for overclocking may operate at a
lower frequency than the vendor-marked value. To operate at the vendor-
marked or at a higher frequency, see section 3.4 Ai Tweaker menu for
manual memory frequency adjustment.
The memory modules may require a better cooling system to work stably
under full loading (4 DIMMs) or overclocking setting.
XP/Vista 32-bit operation system, a total memory of
®
Chapter 2: Hardware information
XP/Vista 32-bit operation
®