2.4.2Memory configurations

You may install 256 MB, 512 MB, 1 GB, and 2 GB unbuffered ECC and non‑ECC DDR2 DIMMs into the DIMM sockets.

Recommended Memory Configurations

Mode

 

Sockets

 

DIMM_A1

DIMM_A2

DIMM_B1

DIMM_B2

 

Single-Channel

Populated

–

–

–

–

–

Populated

–

 

Dual-channel (1)

Populated

–

Populated

–

Dual-channel (2)

Populated

Populated

Populated

Populated

• 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.

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.

64-bit

Windows® XP Professional x64 Edition

Windows® Vista x64 Edition

•Some old-version DDR2-800 DIMMs may not match Intel®’s

On‑Die‑Termination (ODT) requirement and will automatically downgrade to run at DDR2-667. 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.

ASUS P5E

2-15