Why do DRAM chips come in different column widths (x4, x8, x16)? Why didn't we decide that, say, all chips must be x8? What are the use cases for different bit widths?
And why do we sometimes use x4 chips in PC/server DIMMs, when we have to array twice as many chips to reach a 64-bit word size compared to x8 chips? That seems counterintuitive, it means having twice as many chips on the DIMM and makes routing more complicated. 🤔
Does anyone know?

