The ProDesk 400 G5 and 600 G5 Desktop Mini PCs can be equipped with Intel's gen 9 CPUs up to i9-9900T coupled with up to 64 GB of DDR4-2666 (32 GB max for the 600 G5 model) and a SATA SDD / HDD + NVMe SSD storage combo. The chassis size allows these models to be easily mounted on monitor backs.
https://www.notebookcheck.net/HP-announces-ProDesk-mini-PCs-with-Intel-gen-9-CPUs.427148.0.html