M1 Mac RAM and storage can be upgraded after purchase, but it's not easy - 9to5Mac
Apple 2021 MacBook Pro (16-inch, M1 Pro chip with 10‑core CPU and 16‑core GPU, 16GB RAM, 1TB SSD) - Silver
Ecco perché gli SSD base degli M2 sono più lenti di quelli M1
Zheino M1 mSATA 128GB SSD Internal Solid State Drive HARD DRIVE For Table PC Laptop Notebook|state drive|internal solid state drivesolid state drive - AliExpress