- Physical Lengths
- 30-pin SIMM 3.50 inches.
- 72-pin SIMM 4.25 inches.
- 168-pin DIMM 5.25 inches.
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 good information.
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 | ||
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.
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