Memory System

SETUP H/W .3

3.HARDWARE SETUP

3.5.4Memory Installation

WARNING! Unplug your power supply when adding or removing memory modules or other system components. Failure to do so may cause severe damage to both your motherboard and expansion cards (see 3.3 Hardware Setup Procedure for more information).

Insert the module(s) as shown. Each type of module will only fit in the orientations shown below:

The 184-pin DIMM must be a 2.5V unbuffered DDR SDRAM. Each DDR DIMM has a single notch slightly to the right of center:

104 Pins

A7A266

80 Pins

A7A266 184-Pin DDR DIMM Sockets

The 168-pin DIMM must be a 3.3V unbuffered SDR SDRAM. Look for two notches on each SDR DIMM:

88 Pins

A7A266

60 Pins

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20 Pins

A7A266 168-Pin SDR DIMM Sockets

 

 

 

 

 

 

 

 

 

 

 

Lock

 

168-Pin DIMM Notch Key Definitions (3.3V)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DRAM Key Position

Voltage Key Position

RFU

Unbuffered

5.0V

Reserved

Buffered

 

3.3V

26

ASUS A7A266 User’s Manual