Using host memory for SSD caches is part of the NVMe spec, it's not some Apple-magic-integration thing: https://www.servethehome.com/what-are-host-memory-buffer

Using host memory for SSD caches is part of the NVMe spec, it's not some Apple-magic-integration thing: https://www.servethehome.com/what-are-host-memory-buffer-or-hmb-nvme-ssds/ https://www.servethehome.com/what-are-host-memory-buffer-or-... It's also still typically just worse than an actual dram cache.