Asus M3A78 User Manual download pdf (Page 21)

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 ts 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 gure 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

M3A78

DIMM_B1

DIMM_A2

DIMM_B2

DIMM_A1

128 Pins

112 Pins

Chapter 1: Product introduction 1-11

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Asus M3A78 User Manual Page 21