Where did the opinion come from that you need to use RAM from only one set?

Question

RAM

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What can be the incompatibility of different plates?

Answer 1

A long time ago, multi-channel mode was not enabled with every bar. (moreover, the funniest thing was shuffling the bars between the slots into such a combination, in which the multi-channel mode was still turned on and worked successfully) Also, the multi-channel mode did not turn on when the timings were spread, because each channel thrashed at its own timings. There were also bars that either did not know how to use SPD , or stored settings that were actually unstable there.
But one day, the BIOS programmers had an insight that the multi-channel mode is still more important than the greater responsiveness of any channel. Since then, the BIOS sets the parameters of the slowest bar to all the others and raises the multi-channel mode with a cheerful hoot.