Different types of system memory

What is memory and what does it do? The last time more and more different types of memory on the market. What are the differences between these memory modules?


What is the internal memory

Each computer has internal memory. This memory is needed to run applications quickly. In this memory, information is temporarily stored. This information is almost immediately available for the processor. If not it must be searched on the hard disk and it takes very long. Is there space in the memory deficit, then the information (temporary) to the hard disk and then sent back to be searched.

With lack of memory in the computer:

* Will programs run slowly or not.
* Will start up programs slow.
* Can you little or no programs at the same time.
* Will the speed of the computer as a whole slow.
* Will the hard disk more frequently used, making it shorter life.


Different memory
There are several types of memory:

* SDR: Single Data Rate memory. This memory is in the older computers.
* DDR: Dual Data Rate memory. This memory is in most pentium 4 computers and AMD to 3ghz. Was a few years ago the most used.
* DDR2: This is the most common memory. and is significantly faster than DDR.
* DDR3: Is currently on the market as a successor to DDR2.
* SO-DIMM: Memory Modules in a laptop. These are smaller than standard memory modules.


Each type has a subdivision with several speeds. There is DDR 400, DDR2 533, 667, 800, 1000, 1066 etc. The higher the speed the memory is the faster information can be obtained. This is not only memory but also the processor off. The memory and the processor should preferably have the same memory bus speed. With faster memory than the memory of the processor, there is no performance gain.

The connections of the memory modules are different. This is not possible for the modules themselves to exchange. This can also be cut to the line side of the memory and motherboard.