P2B-LS Pentium II Motherboards USER'S MANUAL

18 ASUS P2B-L/P2B-S/P2B-LS User’s Manual

System Memory

III. INSTALLATION

DIMM Memory Installation Procedures:

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 as shown. DRAM

SIMM modules have the same pin contacts on both sides. SDRAM DIMMs have

different pin contacts on each side and therefore have a higher pin density.

Lock

P2B-L/S/LS 168-Pin DIMM Memory Sockets

(FRONT)

88 Pins60 Pins20 Pins

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

Voltage Key Position

Unbuffered

RFU

Buffered

Reserved

3.3V

5.0V

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.