Originally Posted by rdr09
Been reading ram speed does not really matter with Zen2. I guess those aspiring for 4000MHz and higher just want to see the numbers.
That's a bit misleading. As with everything, there are diminishing returns at a certain point.
TPU has a memory scaling piece on the 3900x https://www.techpowerup.com/review/a...ing-benchmark/
Generally, Infinity Fabric scales to 3600 MHz memory clockspeeds 1:1 and has a 1800 MHz clock then. Beyond that you can get it to 1900 MHz with some tweaking. Over that (so 4000 MHz memory clockspeeds) you need to run it decoupled from the memory clock and that accrues some additional latencies. So 3600 MHz / 3800 MHz is generally the sweet spot for Zen2.
Performance increases from 2400 to 2666 by about 1% in games and applications, and from 2400 to 3600 by about 4% to 5%. So just running 2400 or 2666 leaves performance on the table.