I was curious as to what Intel’s number’s look like. Found the 2nd gen Ryzen matched the random latency for the 7th gen i7, but while the 3rd gen at 3733CL17 gets 67ns, it’s 53-54 ns for the 8th and 9th gen i7/i9. So that’s narrowed to 13 ns slower, a 24% drop in performance (or a 20% improvement, depending on how you look at it...) While it does matter, we’re comparing 8 core parts to 12 core parts, so it’s possible that 50% more cores outweighs a 24% increase in memory latency, or alternatively that 33% fewer cores could hurt performance more than 20% faster memory latency. Ehh... it’s a mixed bag for me. I can see how increased memory latency hurts performance, and it’s unclear what the minimum random latency is at different CL settings and speeds on the Intel side. Also there’s a slight single digit ns penalty to sharing memory across units, a concept the comparable Intel parts don’t have, if I’m reading this right.
That said, the X570 chipset has PCIe 4.0 with improved power management to match, even at the ITX end. But PCIe 4 will likely go through implementation improvements and right now is only useful for storage in really fast Raid configurations, 15GB/sec performance from 4 drives has been demonstrated at a relatively cheap cost, comparable to high end commodity NVMe PCI 3 storage.
I wish it were obvious which part was “best” but different implementations lead to different optimizations/costs/benefits...