How to read the manufacturer's sticker on the RAM module for the necessary information?

Question

Iron

Good evening.
For example, the string "4GB 2Rx8 PC3-12800S-11-11-F3". Clearly this is a 4GB module, but what does everything else mean?

Answer 1

2Rx8 - number of rows (rank) of memory chips, x8 - data bus width of memory chips (8 bits). This marking is related to the density of the memory chips used on the module, and hence the compatibility.
PC3-12800 - memory standard
11-11-F3 - timings