https://www.cnet.com/news/intel-core-i9-9980hk-leads-second-wave-ninth-generation-cpu-blitz/

For ninth-generation, many of these are minor bumps over their predecessors, albeit not all in the same way. For instance, the mobile i7-9750H has a slightly faster boost clock of 4.5GHz to the i7-8750H's 4.3GHz, plus an extra 3MB of cache, while the i5-9400H just gets a tiny bump of 0.1MHz in the boost clock.

However, the supporting chipset for the ninth-gen mobile processors brings support for Wi-Fi 6 AX200, Intel Optane H10 (which can integrate the storage cache with the SSD), and 128GB RAM.