Ramtyperna

Ramtyperna is a Swedish term used to describe the various forms of random access memory (RAM) employed in computing. RAM refers to the fast, volatile memory that a computer uses to store data for active programs. In everyday use, RAM is distinguished from non-volatile storage such as hard drives or solid-state drives, which retain data without power.

RAM types are broadly categorized by technology and purpose. The main distinction is between dynamic RAM (DRAM) and static RAM (SRAM). DRAM is used for the main system memory due to its higher density and lower cost, but it requires regular refreshing. SRAM is faster and more power-efficient per access but is more expensive and used primarily for cache memory inside CPUs and other components. Within DRAM, generations such as SDR, DDR, DDR2, DDR3, DDR4, and DDR5 define data transfer rates and signaling standards. Today, desktop and laptop systems commonly use DDR4 or DDR5 modules.

Form factors and packaging also differentiate RAM types. DIMMs are the standard for desktops, while SODIMMs are used in laptops and compact devices. Server environments may use registered ECC or load-reduced DIMMs for error checking and scalability. RAM modules are available in a range of capacities and speeds, with labels indicating transfer rates (for example, MT/s) and latency (CAS latency).

Other RAM-related types include graphics memory, such as GDDR and HBM, used by GPUs, and cache SRAM within processors. Non-volatile RAM technologies (e.g., MRAM, PCM) exist, but they are not the typical main memory in consumer devices.

See also: memory, RAM in computing, memory modules, DDR generations, computer hardware.