1.7.1 Overview Asus prime Asus M3A78

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3. 

Align the other end of the retention bracket to the retention module base. A clicking 

sound denotes that the retention bracket is in place.

Ensure that the fan and heatsink assembly perfectly fits the retention mechanism module 

base, otherwise you cannot snap the retention bracket  in place.

4. 

Push down the retention bracket lock on the retention mechanism to secure the 

heatsink and fan to the module base.

5. 

When the fan and heatsink assembly is in place, connect the CPU fan cable to the 

connector on the motherboard labeled CPU_FAN.

Do not forget to connect the CPU fan connector! Hardware monitoring errors can occur if 

you fail to plug this connector.

1.7 

System memory

1.7.1 

Overview

The motherboard comes with four Double Data Rate 2 (DDR2) Dual Inline Memory Modules 

(DIMM) sockets. A DDR2 module 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 figure illustrates the location of 

the DDR2 DIMM sockets:

Channel

Sockets

Channel A

DIMM_A1 + DIMM A2

Channel B

DIMM_B1 + DIMM B2

M3A78 240-pin DDR2 DIMM Sockets

R

M3A78

DIMM_B1

DIMM_A2

DIMM_B2

DIMM_A1

128 Pins

11

2 Pins

Chapter 1: Product introduction

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