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Memory (or RAM) sizing can be easy or difficult.
Some memory is marked with its size. Some memory is not.
Common sizes of RAM are often powers of two listed in gigabytes (GB) and older types in megabytes (MB):
- 8 GB
- 4 GB
- 2 GB
- 1 GB
- 512 MB
- 256 MB
- 128 MB
If the memory is not marked with its size, you may need to google for its model number to figure out its size. Sometimes, however, you can read its model number and make a very good guess as to its size.