Windows Vista 64-bit editions
Windows Vista 64-bit editions are the part of family of Microsoft operating systems have got 64-bit editions of the Windows Vista. They differ from the 32-bit editions in that the operating systems operate on the 64-bit mode of processors that support that mode. The processors which which 64 bit edition operates includes Intel Xeon, Intel Core 2, AMD Opteron and AMD Athlon 64.
Only Windows Starter edition is available in simple mode and the rest of the versions are in 32 bit and 64 bit editions. Vista retail version distributed by MsAS has both versions the 32 bit and 64 bit its users choice which to choose. The versions distributed by Original Equipment Manufacturers does not have both versions in it .
The best aspect of 64 bit is the performance which is alot better then 32 bit and most of the computers using 64 bit editions out perform those using 32 bit editions.
Vista’s 64 bit editions can run execute most of the programmes which run on 32 bit edition by simply runing them within the WOW64 subsystem. Most of the programmes run without any problems, some have a bit running problem and some don’t even execute at all. For instance is the most commonly run high level language is Visual Basic version 6. The Visual Basic 6 IDE runs natively (very easily) on Vista 32, but it do not even execute on the 64 bit editon. Various applications run on partly timings. Some times on 64 bit and sometimes 32 bit edition.
Old device drivers are particularly problematic, because they need to be rewritten in 64-bit mode. A lot of older hardware doesn't have the necessary support to get the drivers written.
The biggest change which is a very good modification is the elimination of 16 bit subsystems in both 64 and 32 bit editions.This the only change in older 64 bit operating systems and new Vista 32 and 64 bit editions. Older versions of 64 bit windows used to support some 16 bit programs,applications, softwares and installers. But in the new Vista 64 bit editions this support has been removed. WOW64 has historically been designed to recognise these installers and to allow their execution, but in Vista this capability has been removed.
While 32-bit editions of Vista technically can address up to 4GB of memory, limitations with the system's hardware allow only 3GB-3.5GB to a 32-bit operating system, allowing the other parts on the systems use the memory. The 64-bit edition greatly expands this limit as the memory pointers can address large address spaces. According to Microsoft some of the media and video applications give high performance on 64 bit editions as compared 32 bit editions.
The 64-bit editions require all kernel-mode drivers to have a digital signature, and Kernel Patch Protection was introduced with the 64-bit editions of Windows XP and Windows Server 2003 in 2005 to protect the kernel from being patched while it is running, which aims to improve overall system stability and reduce susceptibility to malware.