Asus M2A74-AM SE User Manual download pdf (Page 12)

1.3 Central Processing Unit (CPU)

The motherboard comes with a CPU socket designed for AMD

AM3 Phenom™ II /

Athlon™ X4 / Athlon™ X3 / Athlon™ X2 processors and AM2+ / AM2 Phenom™ X4 /

Phenom™ X3 / Athlon™ X2 / Athlon™ / Sempron™ processors.

The CPU socket is not compatible with AMD

Opteron™ processors. Do not install an

Opteron™ processor on this motherboard.

1.4 System memory

1.4.1 Overview

This motherboard comes with two Double Data Rate 2 (DDR2) Dual Inline Memory Modules

(DIMM) sockets. A DDR2 DIMM has the same physical dimensions as a DDR DIMM but

has a 240-pin footprint compared to the 184-pin DDR DIMM. DDR2 DIMMs are notched

differently to prevent installation on a DDR DIMM socket.The gure illustrates the location of

the DDR2 DIMM sockets:

• 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 the 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 the 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 do either of the

following:

- Install a maximum of 3GB system memory if you are using a 32-bit Windows

OS.

- Use a 64-bit Windows

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

motherboard.

• This motherboard does not support DIMMs made up of 256 megabits (Mb) chips or less.

1.4.2 Memory congurations

You may install 512MB, 1GB, 2GB, and 4GB unbuffered ECC and non-ECC DDR2 DIMMs

into the DIMM sockets.

Channel Sockets

Channel A DIMM_A1

Channel B DIMM_B1

The motherboard supports up to 8GB memory modules on Windows

XP Professional x64

and Vista x64 editions. You may install a maximum of 4GB DIMMs on each slot.

Chapter 1: Product introduction1-3

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Asus M2A74-AM SE User Manual Page 12