Asus P5Q-EM - Manual (Page 32)

1-20 Chapter 1: Product introduction
1.7.2 Memory configurations
You may install 512 MB, 1 GB, 2 GB, and 4 GB non-ECC, unbuffered, DDR2
DIMMs into the DIMM sockets.
• Due to chipset behavior, to obtain memory frequency higher than DDR2
800, you can manually adjust DRAM Frequency in BIOS settings. Refer to
2.4 Ai Tweaker menu for details.
• 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 modules 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.
• When installing total memory of 4GB capacity or more, Windows ® 32-bit
operation system may only recognize less than 3GB. Hence, a total
installed memory of less than 3 GB is recommended.
• This motherboard does not support memory modules made up of 256 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.
• 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 2.4 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.
64-bit
Windows ® XP Professional x64 Edition
Windows ® Vista x64 Edition