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نسخة 64 بت تقبل حجم اكبر للرام (الذاكرة الظاهرية) و تسمح بأستخدامها بشكل كامل
memory access limit of 4GB (2^32 bytes). This permits you to use about 2.75-3.5GB of RAM after IO reservations are factored in.
امكانية عالية لنظام 64 بت في حجز مساحة كبير للذاكرة pagefile و يعتمد على اصدارة النظام .
On paper, the 64-bit architecture can address 16 exabytes of memory (2^64), or more than 4 billion times that of its precursor. Consumer editions of Windows Vista permit from 8GB to 128GB of physical memory to be accessed, depending on the version. Windows 7 bumps that up to 192GB with the Professional version and above.
آمان اكثر و حماية من الفيروسات Kernel Patch Protection Other benefits of running a 64-bit OS include enhanced security with hardware-backed DEP, Kernel Patch Protection and mandatory driver signing.
Not only are there going to be several Windows 7 editions, but you will also need to decide if you are going to run a 32 bit or 64 bit version of the operating system. If your CPU is more than a few years old there is a good chance that you can only run the 32 bit version of Windows 7, however if you have a modern processor you may have to decide between each version.
The 32 or 64 bit architecture refers to the memory address length that can be referenced by the processor. This also has an impact on the maximum amount of memory that can be utilised, which is 4GB for a 32 bit CPU (but in reality the maximum accessible ram is closer to 3.4 GB due to other hardware allocations).
Having a 64 bit OS doesn’t automatically make all applications faster because much of today’s software is written and optimised for a 32 bit era. You’ll need software specifically optimised for 64 bit processing to take advantage of any speed improvements. Fortunately, many games are already including such enhancements.
You may think that using a 64 bit OS for a 64 bit processer is an obvious decision, but it is not so straightforward. Introducing a new architecture will cause new compatibility and driver problems that wouldn’t exist under the old 32 bit version.
Pros and Cons of a 64 bit system:
- You can address much more than 4GB of memory, which is ideal for avid gamers, CAD, video editors and heavy multi-taskers. However, any 32 bit software you use will still be restricted to 4GB memory – you need a 64 bit CPU, OS and applications to take full advantage of the extra RAM.
- 16 bit applications will no longer run. Although this is unlikely to be a problem, if you use very old software (from the Windows 3.1 days!) then it will not work under a 64 bit OS.
- Existing 32 bit drivers no longer work.If you have older or poorly supported hardware you may find that it can no longer be used. Got a 7 year old scanner that just about works in Vista? You may not be able to get it working in 64 bit Windows 7.
- Unsigned kernel-mode drivers no longer work. Along with the issue above, the inability to run unsigned kernel mode drivers will cause problems for old hardware. (There is reportedly a way to bypass this check).
- Running some 32 bit applications on a 64 bit OS could actually be slower. The additional overheads in running 32 bit software in 64 bit mode could cause a slight degradation in performance. It will take some time for 64 bit software to become the norm.
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