Optane is/was sold as pcie/nvme block devices. I use that for durability compared to TLC flash. It was also sold as DRAM format hanging off a memory controller

Optane is/was sold as pcie/nvme block devices. I use that for durability compared to TLC flash. It was also sold as DRAM format hanging off a memory controller and presented as (magically persistent) pages/bytes to the os/application. Theyre different price points.