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All 32-bit editions of Windows Vista, excluding Starter, support up to 4 GB of RAM. The 64-bit edition of Home Basic supports 8 GB of RAM, Home Premium supports 16 GB, and Business, Enterprise, and Ultimate support 128 GB of RAM. [19] All 64-bit versions of Microsoft operating systems impose a 16 TB limit on address space.
A machine running Windows XP Professional x64 Edition cannot be directly upgraded to Windows Vista because the 64-bit Vista DVD mistakenly recognizes XP x64 as a 32-bit system. Windows XP x64 does qualify the customer to use an upgrade copy of Windows Vista or Windows 7, however it must be installed as a clean install.
The IBM System/360 of the 1960s was an early 32-bit computer; it had 32-bit integer registers, although it only used the low order 24 bits of a word for addresses, resulting in a 16 MiB (16 × 1024 2 bytes) address space. 32-bit superminicomputers, such as the DEC VAX, became common in the 1970s, and 32-bit microprocessors, such as the Motorola ...
As with Windows XP Professional x64 Edition, in Windows Vista x64, old 16-bit Windows programs are not supported. If 16-bit software needs to be run in 64-bit Windows Vista, virtualization can be used for running a 32-bit operating system.
Icons of any 16-bit files including New Executables or DLLs are not extracted by Explorer (or any other 32-bit process) even in 32-bit versions, and therefore are not displayed. [15] The shell's Change icon dialog cannot browse 16-bit icon libraries and DLLs.
A machine running Windows XP Professional x64 Edition cannot be directly upgraded to Windows Vista, because the 64 bit Vista DVD mistakenly recognizes XP x64 as a 32-bit system. XP x64 does qualify the customer to use an upgrade copy of Windows Vista or Windows 7, but it must be installed as a clean install.
The maximum number of logical processors [b] in a PC that Windows Vista supports is: 32 for 32-bit; [c] 64 for 64-bit. [ d ] [ 107 ] The maximum number of physical processors in a PC that Windows Vista supports is: one processor for Windows Vista Starter, Windows Vista Home Basic, and Windows Vista Home Premium, and two processors for Windows ...
Windows XP 64-bit can refer to: Windows XP Professional x64 Edition, an operating system for x86-64 processors; Windows XP 64-bit Edition, ...