Datasheet
18
Chapter 1
Hardware
FIGURE 1.6 Various memory module form factors
30-pin SIMM (3.5 x .75") 72-pin SIMM (4.25 x 1")
168-pin DIMM (5.375 x 1")
144-pin SoDIMM (2.625 x 1") 72-pin SoDIMM (2.375 x 1")
The CPU slot can take on several different forms. In the past, the CPU slot was a rect-
angular box called a PGA socket, with many small holes to accommodate the pins on the
bottom of the chip. With the release of new and more-powerful chips, additional holes
were added, changing the configuration of the slot and its designator or number. Figure 1.7
shows a typical PGA-type CPU socket.
With the release of the Pentium II, the architecture of the slot went from a rectangle to
more of an expansion-slot style of interface called an SECC. This style of CPU slot includes
Slot 1 and Slot 2 for Intel CPUs, and Slot A for Athlon (AMD) CPUs. This type of slot
looks much like an expansion slot, but it’s located in a different place on the motherboard
than the other expansion slots.
To see which socket type is used for which processors, examine Table 1.2.
FIGURE 1.7 A PGA CPU socket
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