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Table Of Contents  CertiGuide to A+ (Core Hardware)
 9  Chapter 0011:  System Memory
      9  IV  RAM Packaging

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Single Inline Memory Module (SIMM)
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RAM Sizes and Speeds
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Dual Inline Memory Module (DIMM)

Being approximately 1/8” in thickness, the Dual In-line Memory Module, or DIMM, has become the standard in modern PC's. Because of this decrease in motherboard real estate, motherboards that used to only support about 512MB of RAM can now support of over 1GB of RAM. Additionally, because DIMM modules use a 64-bit data bus, they do not have to be placed in pairs like SIMM modules.

DIMMs fit into special sockets (two notches instead of one) on the motherboard that use 168 pins. DIMMs come in various different flavors. They can be found in 3.30V or 5.0V varieties. You can also get them unbuffered, buffered, or registered. Therefore, you need to be very clear about what your motherboard will support from these for different varieties.

DIMMs

DIMMs
come in 168-pin modules. In a Pentium-class system, one DIMM is needed to make a bank.


Figure 46: 168-pin DIMM.

 


Previous Topic/Section
Single Inline Memory Module (SIMM)
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Next Page
RAM Sizes and Speeds
Next Topic/Section

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