Asus P5QC User Manual download pdf (Page 38)

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.

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