JEDEC has a few frequencies they support: https://www.jedec.org/standards-documents/docs/jesd79-4a

DDR4-1600 (PC4-12800)

DDR4-1866 (PC4-14900)

DDR4-2133 (PC4-17000)

DDR4-2400 (PC4-19200)

DDR4-2666 (PC4-21300)

DDR4-2933 (PC4-23466)

DDR4-3200 (PC4-25600) (the highest supported in the DDR4 generation)

What's *NOT* supported are some enthusiast ones that typically require more than 1.2v for example: 3600 MT/s, 4000 MT/s & 4266 MT/s