Apple upgrade guides
MacBook and Mac mini — memory fixed at purchase; storage via service or Thunderbolt.
MacBook Pro 14-inch (M3, 2023)
Apple Silicon laptop with unified memory soldered to the SoC.
MacBook Air 13-inch (M3, 2024)
Thin ultraportable — unified memory and storage fixed at purchase.
MacBook Air 15-inch (M3, 2024)
Large-screen Air with same upgrade limits as 13-inch M3.
MacBook Pro 16-inch (M3 Pro / Max)
Pro creative laptop — max unified memory on M3 Max configs.
Mac mini (M2 / M2 Pro, 2023)
Desktop Mac — unified memory fixed; user cannot open for RAM.
MacBook Pro 14-inch (M4, 2024)
Latest Pro — unified memory fixed at purchase.
iMac 24-inch (M3, 2023)
All-in-one desktop — unified memory and storage fixed.
Mac Studio (M2 Max / M2 Ultra)
Desktop Apple Silicon — unified memory fixed; storage via service or Thunderbolt.
Mac Pro (M2 Ultra, 2023)
Tower Mac Pro — unified memory fixed; PCIe expansion for Apple I/O cards, not gaming GPUs.
MacBook Pro 16-inch (2019 Intel)
Legacy Intel MacBook Pro — DDR4 SO-DIMM, soldered storage on many configs (T2).