DDR4 4GB 2133MHZ = PC4-17000 4GB. DDR4 4GB 2400MHZ = PC4-19200 4GB. DDR4 4GB 2666MHZ = PC4-21300 4GB. DDR4 8GB 2133MHZ = PC4-17000 8GB. DDR4 8GB 2400MHz = PC4-19200 8GB. DDR4 8GB 2666MHz = PC4-21300 8GB.
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