Dell OptiPlex 3080 SFF
Intel Core i5-10500, 8 GB, 256 GB, SSD
Dell OptiPlex 3080 SFF
Intel Core i5-10500, 8 GB, 256 GB, SSD
The M.2 slot is occupied by the 256GB SSD. The second M.2 slot is only suitable for WLAN cards.
The only remaining option is to install a 2.5" SATA SSD. e.g.
Samsung 870 EVO (1000 GB, 2.5")
You will probably need a SATA data cable and 4 screws.
Here you can familiarise yourself with the inner workings:
www.dell.com/support/kbdoc/en-us/000180605/optiplex-3080-sma...