What do "1Rx8" and "2Rx8" signify on a RAM module?

The designation "1Rx8" and "2Rx8" on a RAM module provides specific information about the number of ranks and the organization of the RAM chips.

The "R" stands for "rank," which refers to the number of sets of memory chips that can be accessed simultaneously. For instance, "1R" indicates a single rank, while "2R" signifies that the RAM module has two ranks. Each rank can be accessed independently, which can enhance performance by allowing more data to be accessed concurrently.

The "x8" indicates the data width of the chips used on the module, meaning each chip can transfer 8 bits of data at a time. The combination of the rank and the chip organization helps in understanding how the module interacts with the memory controller and overall memory architecture.

This information is crucial for system builders or upgraders as it impacts compatibility, performance, and the maximum amount of memory that can be effectively utilized by a particular system.