Asus P5K User Manual Page 38

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2-14 Chapter 2: Hardware information
2.4.2 Memory congurations
You may install 256 MB, 512 MB, 1 GB, and 2 GB unbuffered non-ECC DDR2
DIMMs into the DIMM sockets.
Recommended Memory Congurations
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
conguration. 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.
Mode
Sockets
DIMM_A1 DIMM_B1 DIMM_A2 DIMM_B2
Single-Channel
- Populated - -
Populated - - -
Dual-channel (1) Populated Populated - -
Dual-channel (2) Populated Populated Populated Populated
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.
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