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128-bit refers to one hundred twenty-eight binary (0 or 1) units of integer data. This allows for up to 340,282,366,920,938,463,463,374,607,431,768,211,456 combinations of values.

  • 128-bit color is split into four sets of 32-bit values for 4,294,967,296 levels per RGBAf channel (red, green, blue, and alpha with floating point precision). The three 32-bit RGB values would deliver 79,228,162,514,264,337,593,543,950,336 unique colors, the same as 96-bit floating-point color, but with the addition of 4,294,967,296 levels of transparency defined by the alpha channel. This has been implemented for internal GPU processing,[1] though this far exceeds human visual acuity and computer displays have yet to reach this level of precision.[2]
  • 128-bit sound would allow for a range of up to 340,282,366,920,938,463,463,374,607,431,768,211,456 values (−170,141,183,460,469,231,731,687,303,715,884,105,728 to +170,141,183,460,469,231,731,687,303,715,884,105,727) per sample (Hertz), well beyond the range of human hearing.[3]
  • 128-bit addressing would allow for access to up to 340,282,366,920,938,463,463,374,607,431,768,211,456 bytes,[4] greatly exceeding all the accumulated data on earth as of 2018.[5] This level of precision is mainly used for encryption.[6]
  • 128 bits of data make 16 bytes, referred to by programmers as a double-quadword.


  1. RGBAf, Apple Developer. Accessed 2021-10-01.
  2. Will there ever be 128 bit color depth? by zc3, Tom's Hardware. 2003-09-05.
  3. Ultimate Guide To Audio Bitrate & Audio Formats by Robert Calabrese, Home DJ Studio. 2021-08-03.
  4. Why is it not possible to have a 128 bit OS?, Quora. Accessed 2021-10-01.
  5. How Much Data Is There In the World? by Bernard Marr. 2021-07-02.
  6. What’s the deal with encryption strength —is 128 bit encryption enough or do you need more? by Lance Gutteridge, Medium. 2016-05-06.

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