3. HARDWARE SETUP 3.5.2 DIMM 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. 0 1 0 1 0 1 Lock 20 Pins 60 Pins 88 Pins System Memory 3. H/W SETUP K7M-RM 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) DRAM Key Position Voltage Key Position RFU Buffered Reserved 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 K7M-RM User’s Manual 23 K7M-RM ® Unbuffered 5.0V