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I would definitely say that this system is 64 bit but the owner says it's 32. The computer is a Dell Optiplex 960 which comes both in 32 bit and 64 bit versions but I installed windows 8 64 bit version and it can run 64 bit programs.

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Update

There's Autoit script that checks it, I had to update an older script to make it work

If @CPUARCH = "x86" Then
    $CPUARCH = "32-bit"
Else
    $CPUARCH = "64-bit"
EndIf

If @OSARCH = "x86" Then
    $OSARCH = "32-bit"
Else
    $OSARCH = "64-bit"
EndIf

MsgBox(0, "CPU info", "The CPU is "& $CPUARCH & " and the OS is " & $OSARCH)

I uploaded the compiled binary to sourceforge.

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closed as too localized by Breakthrough, soandos, Brad Patton, Ƭᴇcʜιᴇ007, mpy Jun 5 '13 at 17:03

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10  
If you installed a 64-bit operating system you already know it's a 64-bit processor. The fact the owner had a 32-bit operating system installed doesn't make him wrong. –  Ramhound Jun 2 '13 at 0:53
4  
split the difference - it's a 48 bit system :-) –  user168261 Jun 2 '13 at 0:55
1  
The bit-ness of the 'system' depends on both the computer and the OS. It's always been a 64-bit computer... But if it had a 32-bit OS, it was a 32-bit system at that time. –  BrianAdkins Jun 2 '13 at 1:53
1  
Try this: superuser.com/questions/321988/… –  MaQleod Jun 2 '13 at 2:28
1  
Just hit the Windows+PauseBreak key and you will see if its 32/64bit. –  avirk Jun 2 '13 at 2:56

3 Answers 3

up vote 5 down vote accepted

64 bit processor - according to cpu-z it supports EMT64T - this is intel's version of the x86_64 instruction set. Probably had a 32 bit OS pre-installed - I think that was the period of transition between vista and XP, and while vista had proper 64 bit support, XP64 was a mess. There's a lot of systems that can handle 64 bits, but have 32 bit OSes installed.

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You could also check CPUWorld: http://www.cpu-world.com/CPUs/Core_2/Intel-Core%202%20Duo%20E8500%20EU80570PJ0876M%20-%20AT80570PJ0876M%20(BX80570E8500).html

Data width  64 bit
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1  
All Core 2's are 64 bit. –  Daniel Beck Jun 2 '13 at 11:35

I always lookup the cpu on the manufacturers site, it will tell you if it has a 64bit instruction set or not.

for this processor, an intel core 2 duo e8500, its 64bit

http://ark.intel.com/products/33911

it also says on the cpu-z screen that it supports emt-64 which is Intel's version of the amd64 instruction set, as @ranisalt stated.

lots of information here: https://en.wikipedia.org/wiki/X86-64

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