The Home versions of Vista suffer from some stricter limitations on available main memory and peer-to-peer networking than the non-Home versions. I ’ll summarize these limits as follows:

•  32-bit Vista versions will always be limited to 4 GB of RAM, due to limitations of x86 processors.

• 64-bit Vista versions have dramatically different limitations in the various editions:

• Home Basic is limited to 8 GB or RAM.

• Home Premium is limited to 16 GB of RAM.

• Business, Enterprise, and Ultimate can access over 128 GB of RAM.