What are the main defferences between 32bit and 64bit in Windows Operating Systems?

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Basically you get better performance- but that is up for debate also! Not allot of software out there today takes advantage of the performance gains you get with a 64 Bit OS. Microsoft allows backward compatibility for 32 bit software to run on a 64 bit machine.

Exchange server 2007 is actually only available in 64 bit. You need about 4 GB of RAM on a 64 bit machine to see any improvement. Here are some tech specs Architectural component 64-bit Windows 32-bit Windows Virtual memory 16 terabytes 4 GB Paging file size 512 terabytes 16 terabytes Hyperspace 8 GB 4 MB Paged pool 128 GB 470 MB Non-paged pool 128 GB 256 MB System cache 1 terabyte 1 GB System PTEs 128 GB 660 MB Note: Even 32-bit applications will benefit from increased virtual memory address space when they are running in Windows 64 bit editions.

While 64-bit architectures indisputably make working with huge data sets in applications such as digital video, scientific computing, and large databases easier, there has been considerable debate as to whether they or their 32-bit compatibility modes will be faster than comparably-priced 32-bit systems for other tasks. In x86-64 architecture (AMD64 and Intel 64), the majority of the 32-bit operating systems and applications are able to run smoothly on the 64-bit hardware. Sources: own, wikipedia, microsoft .

Support for more memory and improved application performance To understand how 64 bit architecture works, follow this wikipedia link. Windows has 64 bit editions for both its desktop and enterprise class (server) offerings . Needless to say 64 bit editions work faster and better compared to 32 bit editions.

If you are a desktop user, and run a lot of resource hungry apps (say multi-media creation ,engineering drawing...) you can use the 64 bit edition. You'll need extra memory so that the programs you run don't starve ;) On a 32 Operating System - you are limited to max 4 GB of RAM and 2 GB of virtual memory per process. On a 64 bit OS, support for system and virtual memory will be exponentially larger.

Sources: me , wikipedia .

Drivers are harder to find for the 64-bit version. The main difference is that the 64-bit version can support more and larger memory. The 32-bit version of Windows is limited to 4GB (2^32bits) of RAM while the 64-bit version may address something like 16384 Exabytes (2^64bits).

Programs can also take advantage of wider bus widths in registers and memories. However, 32-bit device drivers will not work in 64-bit Windows and quite a bit of hardware has no available 64-bit drivers yet. All together, the 64-bit version should make certain programs perform faster while leaving others running at exactly the same speed.

However, 64-bit is mainly for future-proofing Windows. At the moment there are no real reasons to be running 64-bit. When 4GB of RAM becomes a bottleneck for the average user, then 64-bit versions of Windows will really make sense.

At that time 64-bit Windows drivers will likely be much easier to find.

The amount of RAM that can be addressed will be the most noticable. Most people will only notice that they can use more then 3gigabytes of RAM. From a programmers point of view, 64bit numbers get computed faster.

This would be mainly of benefit for people working with large dataset.

The difference is more efficient processing of numbers, which is all computers really do Everything a computer does is just 1’s and 0’s. We write programs that interpret these 1’s and 0’s in different ways to make pictures and programs. The better a computer chip can handle these numbers, the faster it runs.

Most of these increases will benefit users of big databases and researchers that really press the computer to its maximum ability. Word processors will run a little faster, but many of the benefits in changing from 32 bit to 64 bit are not seen in everyday applications. An operating system being 32 bit or 64 bit tells you which processors it can run on.

A 64 bit operating system cannot run on a computer with a 32 bit processor. 32 bit operating system may be able to run on a 64 bit processor, but will not be able to take advantage of the improvements. For home computers, the bigger number is better in this case, and the reasons behind it don’t affect us very much.

I hope this helps. Sources: URL1 Manimal's Recommendations Operating System Concepts Amazon List Price: $109.95 Used from: $58.50 Average Customer Rating: 4.0 out of 5 (based on 12 reviews) .

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