by 
The Curious Bag
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Computer memory is usually a location for the rapid storage and retrieval of temporary information, but "memory" can also refer to long-term data storage. For several reasons, memory is handled differently in a laptop than in a desktop.
Memory Basics
A computer's random access memory (RAM) is usually arranged as a Dual Inline Memory Module (DMM). This is a stick-shaped wafer containing memory chips on both sides.
SO-DIMM
Because of the lack of space inside a laptop, manufacturers had to develop the Small Outline or SO-DIMM. This type of RAM stick has smaller dimensions than desktop RAM.
RAM Capacity
However, an SO-DIMM can perform just as fast as desktop RAM, and a comparable type will use just as much electricity, even though an SO-DIMM is about half the size.
Warranties
Most laptop manufacturers allow you to install new SO-DIMMs or replace old ones without voiding your warranty, which is what usually happens when you open the case of an electronic device.
Cost
Usually, a smaller device is more expensive if it performs the same as a bulkier device. However, the reduced amount of materials required for SODIMMs makes their prices comparable to desktop RAM.
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