x64 and x86

[rajwansh2003]

What are OS : x64 and x86.

X64- For 64 Bit processor
x86- For 32 Bit processor
Ok it is understood
why not x32

[desiibond]

it's not x86 and x64. It's actually called x86 and x86-64 (x86 with extended registers)

and yes if you are looking at bits, it's called 32-bit and 64-bit.

[rajwansh2003]

Thanks
I got
x86 comes from the Intel part numbering scheme for CPU chips:

8086
80186
80286
80386 (sometimes called '386)
80486
Pentium thru Pentium IV (which nominally would have been 80586).

The "X" represents the general family of xxx86.

For x64, it Is because of the 64-bits. The x is from the x86 notations.

Source: http://extended64.com/blogs/andre/ar...06/15/837.aspx

[pimpom]

x64 can also be interpreted as "into 64" or "64 times" to represent the number of address bits, whereas the x in x86 can be thought of as a wildcard representing all members of the ....86 family.

[zoras]

How do you find out if your computer is 32 bit or 64 bit in Windows?


Windows XP

If you have Windows XP, there are two methods to determine whether you are running a 32-bit or a 64-bit version. If one does not work, try the other.
Method 1: View System Properties in Control Panel
1. Click Start, and then click Run. 2. Type sysdm.cpl, and then click OK. 3. Click the General tab. The operating system appears as follows: • For a 64-bit version operating system: Microsoft Windows XP Professional x64 Edition Version < Year> appears under System. • For a 32-bit version operating system: Microsoft Windows XP Professional Version <Year> appears under System. Note <Year> is a placeholder for a year.
Method 2: View System Information window
1. Click Start, and then click Run. 2. Type winmsd.exe, and then click OK. 3. When System Summary is selected in the navigation pane, locate Processor under Item in the details pane. Note the value. • If the value that corresponds to Processor starts with x86, the computer is running a 32-bit version of the Windows operating system. • If the value that corresponds to Processor starts with ia64 or AMD64, the computer is running a 64-bit version of the Windows operating system.

This information has been taken from http://support.microsoft.com/kb/827218
for vista follow above link.