From what I’ve seen so far RAM speed is important (only) on Ryzen systems.
Someone explained it somewhere on the forum, I don’t know where anymore.
Somethin about the limitations of the infinity fabric causing the bandwidth to be limited and this can only be helped by having faster RAM to increase the throughput.
found it:
Comparing plot speeds across CPUs - #41 by acrosbug?
Don’t really know if he’s right, but seems to know what’s he’s talking about.