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cache size

does the 3900X not have 64MB cache? https://www.anandtech.com/show/14407/amd-ryzen-3000-announced-five-cpus-12-cores-for-499-up-to-46-ghz-pcie-40-coming-77

function of chipset

What is the function of the chipset in AM4 and Threadripper systems? Some AM4 systems such as the ASROCK A300M-STX appear lack any external chipset (https://www.techforftcp.com/2019/01/asrock-world-smallest-am4-motherboard-deskMini-a300-with-amd-ryzen-support-tech-for-ftcp.html). Threadripper and EPYC systems are similar and the EPYC systems do not use a chipset. The embedded EPYC 3201 on a Supermicro M11SDV all the usual chipset provided PCI devices on the SoC: SMBus, LPC bridge, Audio, USB and SATA. Are the AMD chipsets simply PCIe IO expanders? 73.118.231.121