Types of Random access Memory (RAM)

SDRAM - another of those powerful acronym that describes a lot more than it sounds like it does. The letters stand for Synchronous Dynamic Random Access Memory, and it is a fast method of delivering computing capacity. SDRAM can run at 133 Mhz, which is much faster than earlier RAM technologies. Benefit of SDRAM is what is called pipelining. Because the SDRAM chips are so dense and complex, they can accept more than one write command at a time.

DDR RAM - Double-Data-Rate Synchronous Dynamic Random Access Memory, better known as DDR SDRAM or DDR RAM for short, is a type of very fast computer memory. DDR RAM is based on the same architecture as SDRAM, but utilizes the clock signal differently to transfer twice the data in the same amount of time. DDR is essentially twice as fast as SDRAM. Generally made for the processor 1GHz and faster.

Random DRAM - is Rambus Dynamic Random Access Memory a memory subsystem that promises to transfer up to 1.6 billion bytes per second. The subsystem consists of the random access memory, the RAM controller, and the bus (path) connecting RAM to the microprocessor and devices in the computer that use it. RDRAM is used mainly for video accelerator such as videocams using FireWire and the Accelerated Graphics Port (AGP).

EDO RAM -is stand for Extended Data Out RAM .A earlier dynamic RAM chip that improved the performance of fast page mode (FPM) memory in the mid-1990s. As a subset of fast page mode, it could be substituted for page mode chips. However, if the memory controller was not designed for the faster EDO chips, the performance remained the same as fast page mode.

SIMM - (Single in-line memory module) is a module containing one several access memory (RAM) chips on a small circuit board that connect to the computer motherboard. SIMMs typically come with a 32 data bit (36 bits counting parity bits) path to the computer that requires a 72-pin connector. SIMMs usually come in memory chip multiples of four megabytes.