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Kernel Patch Protection (KPP), informally known as PatchGuard, is a feature of 64-bit editions of Microsoft Windows that prevents patching the kernel. It was first introduced in 2005 with the x64 editions of Windows Vista and Windows Server 2003 Service Pack 1. [1]
In fact, due to the earlier release date of the 32-bit version, many of the key features introduced by Service Pack 2 for 32-bit (x86) editions of Windows XP were already present in the RTM version of its x64 counterpart. [4] Service Pack 2 is the last released service pack for Windows XP Professional x64 Edition.
The first, Windows XP 64-Bit Edition, was intended for IA-64 systems; as IA-64 usage declined on workstations in favor of AMD's x86-64 architecture, the Itanium edition was discontinued in January 2005. [57] A new 64-bit edition supporting the x86-64 architecture, called Windows XP Professional x64 Edition, was released in April 2005. [58]
In fact, due to the earlier release date of the 32-bit version, many of the key features introduced by Service Pack 2 for 32-bit (x86) editions of Windows XP were already present in the RTM version of its 64-bit (x86-64) counterpart. [42] Service Pack 2 is the first and last released service pack for Windows XP Professional x64 Edition.
Windows XP 64-bit Edition; Itanium: Freestyle: October 29, 2002 ... NT 6.1 7601 [d] x86-64, Itanium: January 14, 2020 ... Windows XP Service Pack 3 Windows Embedded ...
The service pack is on a much smaller scale than those released for previous versions of Windows, particularly Windows Vista. [151] Windows 7 Service Pack 1 adds support for Advanced Vector Extensions (AVX), a 256-bit instruction set extension for processors, and improves IKEv2 by
Application service packs replace existing files with updated versions that typically fix bugs or close security holes.If, at a later time, additional components are added to the software using the original media, there is a risk of accidentally mixing older and updated components.
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.