Amd's A300 and X300 chipsets for AM4 are just a bit of rom. Modern CPUs don't really need a chipset; AM4 chipsets connect to the CPU through PCIe, anyway.
AMD EPYC is already that, a SoC - there is no EPYC chipset.
They all have 8x 16-lane multi-function interfaces, which can be configured to work as PCIe, xGMI (inter-socket communucation), or SATA, as well as built-in USB, eMMC, LPC, UART, I2C, SMBus, GPIO.
Yeah, but somebody might insist that the IO-die means that the chipset has moved onto the CPU but still exists.