2.4.2Memory Configurations

You may install 256 MB, 512 MB, and 1 GB unbuffered ECC/non-ECC DDR DIMMs into the DIMM sockets using the memory configurations in this section.

• If you installed four 1 GB memory modules, the system may detect less than 3 GB of total memory because of address space allocation for other critical functions. This limitation applies to Windows® XP 32-bit version operating system since it does not support Physical Address Extension (PAE).

•When using only one DDR DIMM module, install it into slot DIMM_B1 only.

•For single-channel memory configuration, start installing the DDR DIMMs from slot DIMM_B1 or DMM_B2.

•For dual-channel memory configuration, install the DIMMs in slots DIMM_B1 and DIMM_A1 (blue slots); install another pair of DIMMs in slots DIMM_B2 and DIMM_A2 (black slots).

•Always install DIMMs with the same CAS latency. For optimum results, we recommend that you obtain memory modules from the same vendor. Refer to the Qualified Vendors List on the next page for details.

•When you install four double-sided 400 MHz DDR DIMMs, the frequency of each module downgrades to 333 MHz.

Recommended memory configurations

 

 

 

Sockets

 

M o d e

 

DIMM _ A1

DIMM _ A2

DIMM _ B1

DIMM _ B2

Single-channel

(1)

–

–

Populated

–

Dual-channel*

(1)

Populated

–

Populated

–

 

(2)

Populated

Populated

Populated

Populated

*Use only identical DDR DIMM pairs.

*For dual-channel configuration (2), you may:

•install identical DIMMs in all four sockets

O R

•install identical DIMM pair in DIMM_A1 and DIMM_B1 (blue sockets)

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Chapter 2: Hardware information