Memory Configurations - Asus P5Q-E Hardware User Manual

2.4.2

Memory configurations

You may install 512 MB, 1 GB, 2 GB and 4GB unbuffered and non-ECC 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 16 GB
on the operating systems listed below. You may install a maximum of 4 GB
DIMMs on each slot.
Windows ® XP Professional 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
64-bit
Vista x64 Edition
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®
XP/Vista 32-bit operation
Chapter 2: Hardware information