- 2 GB with Windows 7 Starter Edition
- 4GB with other Windows 7 versions
- 1 Socket
- 1 GB (Removable)
- Thanks to our customer D. Harrop for confirming that 4GB modules are indeed compatible with the NB550D.
- Note, with a 32-bit OS, only 3.2GB is usable. With a 64-bit OS the full 4GB is recognised.