Asus user manual Dimm Memory Installation, MES-VM 168-Pin Dimm Sockets

3.HARDWARE SETUP

3.5.3DIMM Memory Installation

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 mod- ules 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.

1	2	Lock
		88 pins
		60 pins	1	2
			Socket	Socket
		20 pins
			DIMM	DIMM
		Lock

MES-VM 168-Pin DIMM Sockets

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

168-Pin DIMM Notch Key Definitions (3.3V)

System Memory

3. H/W SETUP

DRAM Key Position Voltage Key Position

RFU	Unbuffered	5.0V	Reserved
Buffered			3.3V

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 pur- chasing. This motherboard supports four clock signals.

ASUS MES-VM User’s Manual 17