Micron Memory Part Number Decoder ^new^ (8K UHD)

The next characters define the DRAM generation and voltage. In “40A,” the “40” indicates DDR4 SDRAM. (For DDR3, this would be “41” or “8K”; for DDR5, newer prefixes like “60B” appear). The “A” denotes the specific version or design family, often linked to voltage—for example, “A” typically signifies 1.2V VDD/VDDQ for DDR4. This field is critical because mixing voltages can destroy components.