What does PC3 mean?

4GB (2*2GB) DDR3 1333MHz CL9 PC3 RAM

Some rams have this in their names,some do not.What difference do they have?

Thanks
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More about what mean
  1. Hi.

    PC = DDR
    PC2 = DDR2
    PC3 = DDR3
    None = DDR, DDR2 or DDR3. Not difference if your RAM has or not the PC x.
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