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1.4

System memory

Overview

This motherboard comes with four Double Data Rate 3 (DDR3) Dual Inline Memory Module

(DIMM) sockets. The figure illustrates the location of the DDR3 DIMM sockets:

•

1‑10

DIMM_A1

DIMM_B1

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 optimal compatibility, we

recommend that you install memory modules of the same version or date code (D/C)

from the same vendor. Check with the retailer to get the correct memory modules.

Due to the memory address limitation on 32‑bit Windows

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 do any of the

following:

Use a maximum of 3GB system memory if you are using a 32‑bit Windows

‑

I nstall a 64‑bit Windows

motherboard.

‑

F or more details, refer to the Microsoft

com/kb/929605/en‑us.

The default memory operation frequency is dependent on its Serial Presence Detect

(SPD), which is the standard way of accessing information from a memory module.

Under the default state, some memory modules for overclocking may operate at a

lower frequency than the vendor‑marked value.

For system stability, use a more efficient memory cooling system to support a full

memory load (4 DIMMs).

Refer to www.asus.com for the latest Memory QVL (Qualified Vendors List)

Channel

Channel A

Channel B

OS if you want to install 4GB or more on the

support site at http://support.microsoft.

Chapter 1: Product introduction

Sockets

DIMM_A1

DIMM_B1

OS, when you install 4GB

OS.