What Does x86 and x64 Mean

x64 (or x86-64 or AMD64)

1. x64 architecture, also known as 64-bit architecture, is the newer and more advanced architecture used in modern processors and operating systems. It evolved from the x86 architecture to support 64-bit computing.
2. The x64 architecture allows for significantly larger memory addressing, enabling access to much more RAM. A 64-bit operating system can theoretically address up to 16 exabytes (EB) of RAM (1 EB = 1,024 PB), which is a massive amount of memory compared to the 4 GB limit of x86 architecture.
3. With the ability to access more RAM, 64-bit systems can handle more complex applications, perform better with memory-intensive tasks, and support advanced software, particularly in fields like graphics, video editing, and scientific computing.
4. The memory addresses in x64 architecture are represented using 64 bits, providing a much larger address space than the 32-bit x86 architecture.

Key Differences

1. Memory Addressing: x86 architecture uses 32-bit memory addressing, limiting the amount of RAM accessible to around 4 GB, while x64 architecture uses 64-bit memory addressing, enabling access to much larger amounts of RAM, up to several exabytes.
2. Application Compatibility: 32-bit applications are designed to work on both x86 and x64 systems, but 64-bit applications are specifically optimized for x64 architecture. However, most modern systems are backward compatible and can run 32-bit applications on 64-bit operating systems.
3. Performance: In general, 64-bit systems perform better in memory-intensive tasks due to their ability to access larger amounts of RAM and utilize more powerful instructions.
4. Compatibility: Some older hardware and software may not be compatible with 64-bit systems, as they were designed for 32-bit environments. However, most modern hardware and software support 64-bit architecture.

Choosing Between x64 and x86

For most users and modern systems, using a 64-bit operating system (x64) is recommended, as it provides better performance, access to more RAM, and compatibility with the latest software. However, if you have older hardware or specific software requirements, you may need to use a 32-bit operating system (x86). Always check the system requirements of the software and ensure that your hardware supports the chosen architecture.

How to determine if Windows OS is 32-bit (x86) or 64-bit (x64)

Open the Power User menu. Press the Windows key + X to open this menu. Click on System.

There is ne another way you can understand that if your PC is running 64-bit Windows, you'll probably find a Program Files (x86) folder on your hard drive. This stores 32-bit applications, while the other 'Program Files' folder contains all the 64-bit apps you've installed.