To ensure an apples and apples comparison, make sure you are looking at the right type of memory (SO-DIMM, DIMM, pins etc. and generation DDR3, DDR4 etc.), at the same speed (2133 MHz, 2666 MHz etc.), at the same density (e.g. 8GB, 16GB, 32GB etc. per module), at the same latency (CL19, CL17 etc.) and of the same era.
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