Asus P5QL-E - Manual (Page 36)

2-12 Chapter 2: Hardware information
2.4.2 Memory configurations
You may install 256 MB, 512 MB, 1 GB, 2 GB, and 4GB unbuffered non-ECC
DDR2 DIMMs into the DIMM sockets.
Recommended Memory Configurations
• 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 module 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 ® 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.
• This motherboard does not support memory modules made up of 128 Mb
chips.
Mode
Sockets
DIMM_A1 DIMM_A2 DIMM_B1 DIMM_B2
Single-Channel
Populated – – –
– – Populated –
Dual-channel (1) Populated – Populated –
Dual-channel (2) Populated Populated Populated Populated
• 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 4.4 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.