Memory System

SETUP H/W .3

3.HARDWARE SETUP

3.5System Memory

This motherboard features two Double Data Rate (DDR) Dual Inline Memory Module sockets and three Single Data Rate (SDR) Dual Inline Memory Module sockets.

3.5.1 DDR DIMM Support

The two DDR DIMM sockets support 2.5Volt (power level) unbuffered Double Data Rate Synchronous Dynamic Random Access Memory (DDR SDRAM) of 64MB, 128MB, 256MB, 512MB, and 1GB to form a memory size between 64MB to 2GB. One side (with memory chips) of the DIMM takes up one row on the motherboard.

DDR DIMMs support non-ECC modules that are available in unbuffered (typically used in PCs) versions.

NOTE: The DDR memory bus runs at the same frequency as the CPU front side bus.

Install memory in any combination as follows:

DIMM Location

184-pin DDR DIMM

Total Memory

Socket 1 (Rows 0&1)

64MB, 128MB, 256MB, 512MB, 1GB

x1

 

 

 

Socket 2 (Rows 2&3)

64MB, 128MB, 256MB, 512MB, 1GB

x1

 

 

 

 

Total System Memory (Max 2GB)

=

 

 

 

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-E

 

 

 

 

 

 

 

 

 

 

 

80 Pins

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

A7A266-E 184-Pin DDR DIMM Sockets

IMPORTANT! DO NOT mix DDR and SDR SDRAMs. Mixing DDR and SDR SDRAMs may damage the DDR modules!

WARNING! Be sure that the DIMMs you use can handle the specified SDRAM MHz or else bootup will not be possible.

22

ASUS A7A266-E User’s Manual