General Computer Memory (RAM) Information

There are many different types of memory and this page is by no means a complete dissertation on the various types of memory you will find in computers or printers. For more detailed information, Kingston Technologies has a lot of very good information.

DDR Memory Naming Conventions Identifying Older Memory
Adding Memory to a Computer  
DDR Memory Naming Conventions
DDR memory is usually designated in one of two ways (i.e. DDR 266MHz or PC2100). This can be confusing if you are someone who does not deal with memory everyday. The table below shows the two naming conventions.
Double Data Rate (DDR) SDRAM Double Data Rate (DDR2) SDRAM
DDR 266MHz PC2100 400MHz DDR2 PC2-3200
DDR 333MHz PC2700 533MHz DDR2 PC2-4200
DDR 400MHz PC3200 667MHz DDR2 PC2-5300
    800MHz DDR2 PC2-6400
    1066MHz DDR2 PC2-8500
Double Data Rate (DDR3) SDRAM  
       
DDR3 1066MHz PC3-8500    

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Identifying Older Memory
The first step in determining what type of memory your system uses is by looking for a manufacturer's part number. The better memory manufacturers will normally attach a label to the memory stick.
If there is no label and you have no clue what type of memory you have you can start by measuring the length of the memory.

Physical 30-Pin SIMM, 72-Pin SIMM, and 168-Pin DIMM Sizes

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Adding Memory to a Computer
When adding memory to a computer all of the memory needs to be the same speed (i.e. PC133, PC3200, etc..) and have the same CL number (Column Access Strobe Latency i.e. CL2, CL3, etc..) or the computer will be unstable.

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