1-12 Chapter 1: Product introduction
1.7.2 Memory congurations
You may install 256 MB, 512 MB, 1 GB and 2 GB unbuffered non-ECC DDR2 DIMMs into the
DIMM sockets.
Notes on memory limitations
• This motherboard only supports up to 4GB on Windows
®
XP x 64 and Vista x 64 editions.
You may install up to 1GB DIMMs on each slot. Install only DDR2 800 and DDR2 667 1GB
DIMMs.
• Some old-version DDR2-800 DIMMs may not match Intel
®
On-Die-Termination (ODT)
requirement and will automatically downgrade to run at DDR-667. If this happens,
contact your memory vendor to check to ODT value.
32-bit 64-bit
Windows
®
XP Windows
®
XP x 64 Edition
Windows
®
Vista Windows
®
Vista x 64 Edition
• 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 conguration. 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, we
recommend that you obtain memory modules from the same vendor.
• Due to the memory address limitation on 32-bit Windows OS, when you install 4GB
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 install a 64-bit
Windows OS when having 4GB or more memory installed on the motherboard.
• This motherboard does not support memory modules made up of 128 Mb chips.
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