Asus P5QL-E User Manual - Page 36

Memory configurations

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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 Mode DIMM_A1 Sockets DIMM_A2 DIMM_B1 Populated - - Single-Channel - - Populated Dual-channel (1) Populated - Populated Dual-channel (2) Populated Populated Populated DIMM_B2 - - - Populated • 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. • 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. 2-12 Chapter 2: Hardware information

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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.