Memory Installation - Asus A7A133 User Manual

3. HARDWARE SETUP

3.5.2 Memory Installation

WARNING!
Make sure that you 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. Because the number of pins are different on either
side of the breaks, the module will only fit in the orientation shown. SDRAM DIMMs
have different pin contacts on each side and therefore have a higher pin density.
(DRAM SIMM modules have the same pin contacts on both sides.)
A7A133
A7A133 168-Pin DIMM Sockets
The DIMMs must be 3.3Volt unbuffered SDRAMs. To determine the DIMM type,
check the notches on the DIMMs (see figure below).
168-Pin DIMM Notch Key Definitions (3.3V)
DRAM Key Position
RFU
Buffered
The notches on the DIMM will shift between left, center, or right to identify the type
and also to prevent the wrong type from being inserted into the DIMM slot on the
motherboard. You must tell your retailer the correct DIMM type before purchasing.
This motherboard supports four clock signals per DIMM.
Unbuffered
ASUS A7A133 User's Manual
88 Pins
60 Pins
20 Pins
Voltage Key Position
Reserved
5.0V
3.3V
Lock
23