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In computing, the term 3 GB barrier refers to a limitation of some 32-bit operating systems running on x86 microprocessors. It prevents the operating systems from using all of 4 GiB ( 4 × 10243 bytes) of main memory. [ 1] The exact barrier varies by motherboard and I/O device configuration, particularly the size of video RAM; it may be in the ...
The 2 GB limit refers to a physical memory barrier for a process running on a 32-bit operating system, which can only use a maximum of 2 GB of memory. [1] The problem mainly affects 32-bit versions of operating systems like Microsoft Windows and Linux, although some variants of the latter can overcome this barrier. [2]
Super VGA (800x600), 32-bit color 1024 x 768 for Windows Store apps 1366 x 768 to snap apps Windows 8.1: Windows 10: 1 GHz or faster processor or SoC: 1 GB (x86) 2 GB (x64) 4 GB 16 GB (x86) 20 GB (x64) Super VGA (800x600), 32-bit color Windows Server 2016: 1.4 GHz 64-bit processor 512 MB ECC memory 2 GB with Desktop Experience installed [24 ...
A 32-bit register can store 2 32 different values. The range of integer values that can be stored in 32 bits depends on the integer representation used. With the two most common representations, the range is 0 through 4,294,967,295 (2 32 − 1) for representation as an binary number, and −2,147,483,648 (−2 31) through 2,147,483,647 (2 31 − 1) for representation as two's complement.
Limits on physical memory for 32-bit platforms also depend on the presence and use of Physical Address Extension (PAE), which allows 32-bit systems to use more than 4 GB of physical memory. PAE and 64-bit systems may be able to address up to the full address space of the x86 processor.
However, "client" versions of 32-bit Windows (Windows XP SP2 and later, Windows Vista, Windows 7) limit physical address space to the first 4 GB for driver compatibility [16] even though these versions do run in PAE mode if NX support is enabled. Windows 8 and later releases will only run on processors which support PAE, in addition to NX and SSE2.
At the time of launch, Microsoft deemed Windows 7 (with Service Pack 1) and Windows 8.1 users eligible to upgrade to Windows 10 free of charge, so long as the upgrade took place within one year of Windows 10's initial release date. Windows RT and the respective Enterprise editions of Windows 7, 8, and 8.1 were excluded from this offer.
Because of this, the maximum memory available was increased. [13] [34] While Windows 3.0 was limited to 16 MB maximum memory, Windows 3.1 could access a theoretical 4 GB in the 386 enhanced mode. The actual practical ceiling is 256 MB. [35] Like its predecessors, it runs as a 16-bit system; Windows 3.1 is also the last Windows to run in 16-bit ...