DDR4 2400MHz 8GB = PC4-19200 8GB. DDR4 2666MHz 8GB = PC4-21300 8GB. DDR4 3200MHz 8GB = PC4-25600 8GB. DDR4 3200MHz 16GB = PC4-25600 16GB. DDR4 3200MHz 32GB = PC4-25600 32GB. SDRAM For laptop. DDR1 for LAPTOP.
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