Memory Configurations - Asus P5QPL-VM EPU User Manual

1.7.2

Memory configurations

You may install 512MB, 1GB, 2GB, and 4GB unbuffered non-ECC DDR2 DIMMs into the
DIMM sockets.
• You may install varying memory sizes in Channel A and Channel B. The system maps
• Always install DIMMs with the same CAS latency. For optimum compatibility, we
• Due to the memory address limitation on 32-bit Windows
• This motherboard does not support DIMMs made up of 256 megabits (Mb) chips or less.
• This motherboard supports up to 8GB memory modules on Windows
• The default DIMM frequency depends on its Serial Presence Detect (SPD), which is
• For system stability, use a more efficient cooling system to support a full memory load (2
• Some old-version DDR2-800 DIMMs may not match Intel
• Due to chipset limitation, DDR2-800 with CL=4 will be downgraded to run at DDR2-667
1-12
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.
recommend that you obtain memory modules from the same vendor.
or more memory on the motherboard, the actual usable memory for the OS can be
about 3GB or less. For effective use of memory, we recommend that you do any of the
following:
- Install a maximum of 3GB system memory if you are using a 32-bit Windows
OS.
- Use a 64-bit Windows
motherboard.
x64 and Vista x64 editions. You may install a maximum of 4GB DIMMs on each slot.
the standard way of accessing information from a memory module. 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 Advanced menu for manual memory frequency adjustment.
DIMMs) or overclocking conditions.
requirement and will automatically downgrade to run at DDR2-667. If this happens,
contact your memory vendor to check the ODT value.
by default setting. If you want to operate with lower latency, adjust the memory timing
manually.
®
OS if you want to install 4GB or more memory on the
Chapter 1: Product introduction
®
OS, when you install 4GB
®
XP Professional
®
's On-Die-Termination (ODT)
®