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Asus P4S133 User Manual

Page 29

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ASUS P4S133 motherboard user guide

17

2.5.3 Memory configurations

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. DIMM modules are longer and have different pin contact on each
side and therefore have a higher pin density. SIMM modules have the
same pin contact on both sides.

168-Pin DIMM Notch Key Definitions (3.3V)

DRAM Key Position

Voltage Key Position

Unbuffered

RFU

Buffered

Reserved

3.3V

5.0V

The notches on the DIMM module 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 ask your retailer the
correct DIMM type before purchasing. This motherboard supports four
clock signals.

P4S133

®

P4S133 168-Pin DIMM Sockets

20 Pins

60 Pins

88 Pins

The DIMMs must be 3.3V Unbuffered for this motherboard. To determine
the DIMM type, check the notches on the DIMMs (see figure below).