The HP EliteDesk 800 G9 Mini has one PCIe Gen 4 M.2 slot
A single M.2 2280 slot supporting PCIe Gen 4 NVMe SSDs. One fast storage slot — typical for a mini PC this size, but no second slot for expansion.
A single M.2 2280 slot supporting PCIe Gen 4 NVMe SSDs. One fast storage slot — typical for a mini PC this size, but no second slot for expansion.