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Which CPUs are known to use the PGA format?

  1. ARM

  2. Intel

  3. IBM

  4. AMD

The correct answer is: AMD

AMD is known to use the PGA (Pin Grid Array) format for its CPUs. Other major CPU manufacturers such as ARM, Intel, and IBM use different formats such as BGA (Ball Grid Array) or LGA (Land Grid Array) for their chips. Therefore, options A, B, and C are incorrect as they do not use the PGA format.