About Laptop RAM
RAM, which stands for Random Access Memory, refers to a computer hardware component that is responsible for storing and quickly accessing data. Other than processor speed, the amount of RAM a laptop contains is the most important factor in determining how fast it can operate. Knowing how RAM works and becoming familiar with its different types and sizes will help consumers choose the fastest laptop and help laptop owners adequately upgrade their memory.
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Function
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The primary function of RAM is to store data in a manner that allows it to be accessed randomly--that is, without regard to the location or order of the data. Unlike other computer data-storage devices that permanently store data, such as hard drives, RAM uses "volatile" storage. This means that the data is stored temporarily and is deleted when the laptop is shut down.
Types
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Common types of laptop RAM are SDRAM, DDR SDRAM, PCMCIA, and SODIMM. SDRAM, or Synchronous Dynamic Random Access Memory, is the most common type of memory. It operates by reading bits of data in the same location of the requested bit of data, resulting in faster, more efficient data retrieval. DDR SDRAM is similar to SDRAM, except that it operates at a greater speed--the "DDR" stands for "Double Data Rate." PCMCIA is a type of memory card that can be used in all laptops, as long as there is an available card bus. SODIMM, or Small Outline Dual Inline Memory Module, is most often used in laptops, because it is smaller than regular DIMMs and uses less energy.
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Size
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Most new laptops have at least 1GB of memory, while higher-end laptops may have more gigabytes of RAM. The greater the amount of memory in a laptop, the faster the machine will respond, especially when you are running multiple applications. Laptops with 1GB of memory usually have expandable memory slots that allow consumers to add memory (up to a certain limit).
Considerations
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Unlike desktop computers, laptops are not equipped with many memory slots. Most laptops are limited to two slots, meaning the most memory they can hold is two 2GB memory modules, for a total of 4GB. When purchasing a new laptop and before purchasing additional memory for an old laptop, consumers should review the laptop's specifications to determine its maximum RAM capacity and the exact type of RAM it requires.
Warning
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When purchasing additional memory for a laptop, consumers should be prepared for the additional expense of having a professional install the memory. Unless the laptop has a door underneath it that can be unscrewed to afford easy access to the memory slots, consumers may have to have a computer-repair technician open the laptop to install the memory. Care should also be taken when installing memory to avoid damaging the motherboard. This includes maintaining the proper grounding so static electricity is not transferred to the laptop during installation.
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Resources
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