Post #2968705

@nytpu@tilde.zone Hmm I don't think this is it, DDR4 x4 chips have the same number of banks as x8 chips but twice as many rows for the same overall size. Why would anyone want that? I don't think that using x4 chips gives you more banks: When DRAM chips are wired together in, say, a DIMM, the width of the data bus is fixed to something like 64 bits. By using x4 chips the designer has to wire 16 x4 chips in parallel instead of 8 x8 chips. All these chips are connected to the same address and control lines, so the same set of rows is open in all the chips at any given time. Using x4 chips lets you make the rank up to twice as big (in terms of bits stored overall) at the cost of having twice as many chips, but you could accomplish the same thing by having two ranks of x8 chips.