How to determine if cpu is 32bitor64bit

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How to determine if CPU is 32 bit or 64 bit ?

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How to determine if cpu is 32bitor64bit

  1. 1. How to determine if CPU is 32 bit Or 64 bit ? Ashwin Pawar ashwinwriter@gmail.com Oct, 2010
  2. 2. This is of the most common question asked on the net, when it comes to determining whether you have a 32 bit or 64 bit processor. Chances are you have a 64bit processor pc but you may be under the impression that you have a 32 bit processor for the fact that you are running a 32 bit Operating System. To start with, a 64 bit processor can talk to both 32 bit or 64 bit operating system, where as a 32bit processor can only talk to 32 bit operating system. Let’s find that out! There are 4 simple ways you can determine if you have a 64bit processor : 1. (On Vista) Open Performance Information and Tools by clicking the Start button , clicking Control Panel, clicking System and Maintenance, and then clicking Performance Information and Tools. Click View and print details. Note : If your computer is already running a 64-bit version of Windows, you won't see the 64-bit capable listing. 2. You can check if your processor supports 64-bit by using CPU-Z, a free little program that displays system info. (If it says AMD64, x86-x64 or EM64T next to Instructions, then it is a 64bit processor). http://www.cpuid.com/cpuz.php 3. You can also download free software from blarc, it builds a detailed profile of your installed software and hardware. (If it says 64bit ready, it is a 64bit processor). http://www.belarc.com/free_download.html 4. Go to Intel website, and look for the value next to "Instruction Set" under the cpu specification. (If it says 64, that means you have a 64bit processor).
  3. 3. Point of confusion : You may come across following methods on the net to find the processor type information using regedit & msinfo32, which can be little deceiving or rather misleading if used in wrong context. First Method: Using regedit: HKEY_LOCAL_MACHINEHARDWAREDESCRIPTIONSystemCentralProcessor0 look for ‘Identifier’ or “Platform ID’. Second Method: Using MSINFO32: Go to Start -> Type msinfo32.exe From the System Information page under System Type. These two methods will return correct information provided you are alerady running a 64bit Operating System, but If you are running a 32bit Operating system then the chances are you will see the cpu type as : x86 , which is incorrect. In other words, If you are running a 32-bit Windows on a 64-bit-capable CPU, you will still get x86 as cpu type. Hence, It is always advisable to check your prcessor type using the tools/methods shown at the beginning of this article. But, both these methods are perfectly correct to find out if a computer is running 32 or 64 bit of windows operating system. The next logical question would be : Why do vendors sell 64-bit processors with 32-bit operating systems? When purchasing a new computer, you may find that the default operating system is a 32- bit edition even though the processor supports 64-bit. This is especially true for desktop systems. The reason for this is that many desktop applications don't benefit significantly from the extended memory support on 64-bit systems, and there is some risk of some compatibility issues with 32-bit desktop applications.
  4. 4. Let’s Get this Right : 64 bit Processor History ? 64-bit processors have been around for a very long time. Intel and HP began development of the 64-bit Itanium processor in 1994 under the codename Merced. Itanium was finally introduced in May 2001 but It was strictly considered a server/workstation processor and not a processor for use in desktop PCs. Additionally, the IA-64 (Intel Architecture 64-bit) instruction set used by the Itanium was completely different from the IA-32 (Intel Architecture 32-bit) instruction set used by standard Intel and AMD PC processors. The start of real 64-bit computing for standard PCs began on April 22, 2003 when the AMD Opteron processor was introduced. The Opteron did not use the IA-64 instruction set from the Itanium, but instead included 64-bit extensions that worked on top of the existing IA-32 instructions developed by Intel. This would allow for greater compatibility with existing software, and make it easier for 32-bit and 64-bit computing to coexist on the same platform. Unfortunately like Itanium, Opteron was also a server/workstation processor, considered far too costly for standard desktop or mobile PCs. Finally on September 23, 2003, AMD released the Athlon 64, truly the first desktop PC processor supporting 64-bit extensions. This would be the breakthrough needed for any significant 64-bit software development to occur. The most signification development was that AMD released these extensions before Intel. On February 17, 2004 Intel introduced its first Pentium 4 processors with 64-bit extensions, the very same extensions as introduced by AMD. Hence, this would allow the same software to work on both AMD and Intel processors, a win win situation for all. Interesting to know that: • AMD calls these extensions AMD64 technology. • Intel calls them EM64T (Extended Memory 64 Technology). • Microsoft calls them x64. Conclusion : It is a 64-bit Processor based on 32-bit Intel-compatible (x86) processor architecture.
  5. 5. Facts: 1. A 64-bit version of Windows Vista supports from 1 GB of RAM to more than 128 GB of RAM, but 4 GB minimum is recommended. 2. A 32-bit version of Windows Vista can access up to 4 GB of RAM only, above this limit, the physical memory is not addressable by 32-bit versions of Windows Vista. 3. All hardware devices need 64-bit drivers to work on a 64-bit version of Windows. What do you mean by 32 bit : The bit size of a processor refers to the size of the address space it can reference, and 32 bit is nothing but 2^32 bytes , which is an equivalent of 4,294,967,296 bytes which means that the CPU can access up to "4,294,967,296" which is ‘4th GB of data’ maximum. Can you upgrade from 32 Bit to 64 Bit OS ? Ans: NO! There is no way to upgrade from 32 Bit to 64 Bit, they are 2 totally different architectures built on different code. Further, there is also no way to downgrade from 64 bit to 32 bit either. Solution : Full fresh install. Caution : • If you do decide to go for 64 bit OS. Most important, check for Device Driver support first, and then check your most used applications if they have a support for 64bit OS, and after that check the rest of the software, make sure they have a 64 Bit OS support as well. • All your programs will have to be reinstalled. Make a thorough backup of your important files before doing the installation. References: http://windows.microsoft.com/en-US/windows-vista/32-bit-and-64-bit-Windows- frequently-asked-questions http://www.lumerical.com/64-bit_photonic_design.php http://www.microsoft.com/windows/pc-scout/laptop-speed-facts.aspx http://support.microsoft.com/kb/946765 http://support.microsoft.com/kb/827218 http://support.microsoft.com/kb/556009

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