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.
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