Even saying 25-30GB/s is weird.

DDR4-3200 is ~26GB/s per channel, and is the upper end of what you'll see on ECC DDR4. DDR5-5600 is common now, and is ~45GB/s.

Zen 2/3 Epycs on SP3 have 8 channels, Zen 4/5 Epycs on the SP5 have 12 channels per socket, and with both you get to have two sockets. That'd be ~410GB/s on dual socket SP3 and ~1080GB/s on dual socket SP5.

So, yeah, RAM goes brrr.

Yeah, but that ram is (somewhat) divided by the number of cores which has also gone up. That's why AMD will sell CPUs with 1 or 2 cores per CCD (instead of 6,8, or 16). I think they have an F in the middle of the numbers.