Random access memory (RAM), also called volatile memory, temporarily stores data and instructions to be later accessed by a computer's processor. It allows the processor to retrieve and return data in random order, without moving the actual storage medium or reading head. Stored data is usually lost when the computer is switched off, although some high-end modules can retain data without CPU power.
Size: Choose a RAM module with a capacity of at least 256 MB for general computing and office use. If you play video games or watch streaming video, choose a 512 MB to 1 GB RAM. For heavy applications like computer-aided design (CAD) and graphics design, look for capacities from 1 GB to 2 GB.
Speed: Choose a RAM with a 133 MHz transfer rate or higher. This will allow you to multitask and run multiple applications with minimum screen delay. If you work with graphics-heavy programs, look for speeds of at least 266 MHz.
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