Question: what is 2r*8 in ram?
Answer: Rank is a set of momory chips working as a one group. Marking 2R means 2 ranks of memory in one RAM module/ stick, 4R - 4 ranks. ... x8 (for exsample PC3 1Rx8) means that phisical memory chips on the DDR module/ PCB holds 8 bit long memory.