How much memory can a 32 bit process access on a 64 bit operating system?

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2 GB by default. If the application is large address space aware (linked with /LARGEADDRESSAWARE), it gets 4 GB (not 3 GB, see http://msdn.microsoft.com/en-us/library/aa366778.aspx)

They’re still limited to 2 GB since many application depends on the top bit of pointers to be zero.

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