DDR
DDR - Double Data Rate
DDR refers to a specification of SDRAM memory, DDR can transfer data at double the rate of normal SDRAM. It achieves this by transferring data twice per clock cycle, once on the rising edge and once on the falling edge of the cycle.
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SDRAM
SDRAM - Synchronous Dynamic Random Access Memory
Refers to a type of memory (DRAM) that can sychronise itself with the processor's bus speed, and can run at much higher speeds than it's EDO counterpart.
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DRAM
DRAM - Dynamic Random Access Memory
A type of memory (RAM) widely used in today's PCs. DRAM works differently to SDRAM as it needs to be refreshed to continue holding the data, this means a slight loss of speed as the memory refreshes itself with a pulse of current to each of its cells.
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RAM
RAM - Random Access Memory
This is the main memory in your computer, this is where the computer stores the data it needs when you are using a program. RAM gets its name from the ability to allow the system to access any data stored in the memory in any location at any time. This memory is often referred to as Volatile (power dependent). i.e. when the power is isolated the data is lost. RAM comes in many different
packages and there are many different types of RAM all designed to be compatible with a certain system.
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EDO
EDO Memory- Extended Data Ouput
Refers to a type of Memory
(DRAM) that can simultaneously request the next block of data as it sends a
block of data to the processor.
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DIMM
DIMM refers to a type of memory module commonly used in modern PCs and Laptops.
DIMMS have a 64-bit data path and are widely used in PCs with 64-bit processors as they don't need to be doubled up unlike SIMMS.
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DUAL INLINE
The dual inline part refers to the way the chips are mounted on the module.
They come in either a 144 pin or 168 pin package, the 144 pin module is commonly used in laptops and the 168 pin modules are used in most modern PC motherboards.
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