Asus P2B-L, P2B-LS, P2B-S DIMM Memory Installation Procedures:, Memory System, P2B-L/S/LS 168-PinDIMM Memory Sockets

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.

INSTALLATION .III

Memory System

20 Pins 60 Pins 88 Pins

Lock

(FRONT)

P2B-L/S/LS 168-Pin DIMM Memory 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		Voltage Key Position
RFU	Unbuffered	5.0V	Reserved
Buffered			3.3V

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.

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