Asus V3-P5G33 - Manual (Page 27)

2-9 ASUS V-Series P5G33
• 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.
• 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.
64-bit
Windows ® XP Professional x64 Edition
Windows ® Vista x64 Edition
Notes on memory limitations
• Due to chipset limitation, this motherboard can only support up to
8 GB on the operating systems listed below. You may install a
maximum of 2 GB DIMMs on each slot.
• Some old-version DDR2-800/667 DIMMs may not match Intel ® ’s
On-Die-Termination (ODT) requirement and will automatically
downgrade to run at DDR2-533. 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.
• Due to chipset limitation, DDR2-667 with CL=3 will be downgraded
to run at DDR2-533 by default setting. If you want to operate with
lower latency, adjust the memory timing manually.