Asus PQ5C Computer Hardware User Manual


 
2-12 Chapter 2: Hardware information
2.4.2 Memory congurations
You may install 512 MB, 1 GB, 2 GB and 4GB unbuffered and non-ECC DDR2
DIMMs or 1 GB, 2 GB and 4GB unbuffered and non-ECC DDR3 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
conguration. Any excess memory from the higher-sized channel is then
mapped for single-channel operation.
For DDR2, it is recommended to install the memory modules from the black
slots for better overclocking capability. For DDR3, only install the memory
modules in the orange slots.
Always install DIMMs with the same CAS latency. For optimum
compatibility, it is recommended that you obtain memory modules from the
same vendor.
This motherboard does not support memory modules made up of 128 Mb
chips.
For DDR2 DIMMs:
If you install two 2 GB or four 1 GB memory modules, the system may
only recognize less than 3 GB 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.
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.
64-bit
Windows
®
XP Professional x64 Edition
Windows
®
Vista x64 Edition
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.