The following Macworld article gives a good summary of probably everything you'd want to know about Apple's new "System on a Chip", also known as the M1 chip. Although the new chip has mostly favorable attributes, it is limited to 16GB of RAM, which apparently is of some concern to some users, who want more RAM. The article mentions that a revised design of the M1 chip might have 64GB of RAM, available by the end of next year. The article also speculates that all Macs will have the M1 chip in about two years.
Jim Hamm