Asus P5QL PRO - Manual (Page 35)

ASUS P5QL PRO 2-13
• 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.
• Always install DIMMs with the same CAS latency. For optimum compatibility,
it is recommended that you obtain memory modules from the same vendor.
• When you install a total memory of 4GB or more, Windows ® 32-bit
operation system may only recognize less than 3GB. Hence, a total
installed memory of less than 3GB is recommended if you are using a
Windows 32-bit operation system.
• This motherboard does not support memory modules made up of 128 Mb
chips.
64-bit
Windows ® XP Professional x64 Edition
Windows ® Vista x64 Edition
This motherboard can support up to 16GB on the operating systems listed
below. You may install a maximum of 4GB DIMMs on each slot.
• 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.
• Some old-version DDR2-800 DIMMs may not match Intel ® ’s
On-Die-Termination (ODT) requirement and will automatically downgrade
to run at DDR2-667. If this happens, contact your memory vendor to check
the ODT value.
• Due to chipset limitation, DDR2-800 with CL=4 will be downgraded to run
at DDR2-667 by default setting. If you want to operate with lower latency,
adjust the memory timing manually.