32-bit vs 64-bit

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Summary

Understanding the 32-bit vs. 64-bit paradigm requires considering the CPU, operating system, and applications as interconnected components. A 64-bit CPU is fundamental for leveraging 64-bit software, typically offering backward compatibility for 32-bit applications, though legacy 16-bit code can still cause issues. Conversely, 32-bit CPUs and operating systems cannot execute 64-bit applications. Developers can quickly identify 32-bit processes on Windows via Task Manager, where they are marked with a "*32" suffix.

I have knowledge on 32-bit vs 64-bit, but not very clear minded.

Here is a good article I found about it.

http://www.techsupportalert.com/content/32-bit-and-64-bit-explained.htm

 

Understand there are 3 things involved: CPU, OS and application.

To work on 64-bit, first thing first is: you need a 64-bit CPU. 64-bit CPU usually provide emulation for 32-bit system. Though some 32-bit application still cannot run on 64-bit OS, because they might contain 16-bit code.

32-bit system won't have compatibility for 64-bit application. Also 32-bit CPU won't run 64-bit OS or application.

 

In windows, you can check whether an application is 32bit in Task Manager. Those process with "*32" suffix is 32-bit application. Wow, I didn't realize there are so many 32-bit applications in my system.

 

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