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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.
®
CUA
CUA 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
RFU
Buffered
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.
Unbuffered
ASUS CUA User's Manual
20 Pins
60 Pins
88 Pins
Voltage Key Position
Reserved
5.0V
3.3V
Lock
25
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