What is the RAM limit in vista both 32 bit and 64 bit?

CepheiA

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Aug 31, 2013
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OS Type: 32bit max RAM / 64bit max RAM

Windows Vista Ultimate: 4 GB / 128 GB
Windows Vista Enterprise: 4 GB / 128 GB
Windows Vista Business: 4 GB / 128 GB
Windows Vista Home Premium: 4 GB / 16 GB
Windows Vista Home Basic: 4 GB / 8 GB
Windows Vista Starter: 1 GB / N/A

With 32 bit usually less than 4GB will be usable. Usually around 3.2 GB or less.