Difference Between 32bit and 64bit Operating Systems (original) (raw)
Last Updated : 10 Apr, 2025
In computing, there are two types of processors, i.e., 32-bit and 64-bit processors. These types of processors tell us how much memory a processor can access from a CPU register. For instance,
- A 32-bit system can access 232 different memory addresses, i.e. 4 GB of RAM or physical memory. Ideally, it can access more than 4 GB of RAM also.
- A 64-bit system can access 264 different memory addresses, i.e. actually 18-quintillion bytes of RAM. In short, any amount of memory greater than 4 GB can be easily handled by it.
What is a 32-bit Operating System?
Most computers made in the 1990s and early 2000s were 32-bit machines. A **32-bit operating system is a type of computer system where the processor (CPU) and software use 32 bits (binary digits) to handle data. A 32-bit system can address a maximum of 232 bytes of memory which is 4 GB (4,294,967,296 bytes) of RAM. The actual limit is often less than around 3.5 GB since part of the register is used to store other temporary values besides memory addresses. Most computers released over the past two decades were built on a 32-bit architecture, hence most operating systems were designed to run on a 32-bit processor.
What is a 64-bit Operating System?
A 64-bit register can theoretically reference 18,446,744,073,709,551,616 bytes or 16 exabytes of memory. This is several million times more than an average workstation would need to access. What's important is that a 64-bit computer (which means it has a 64-bit processor) can access more than 4 GB of RAM. A computer with 8 GB of RAM should have a 64-bit processor. Otherwise, at least 4 GB of memory will be inaccessible by the CPU.
Difference Between 32-bit and 64-bit Operating System
A major difference between 32-bit processors and 64-bit processors is the number of calculations per second they can perform, which affects the speed at which they can complete tasks. 64-bit processors can come in dual-core****,** quad-core, six-core, andeight-coreversions for home computing. Multiple cores allow for an increased number of calculations per second that can be performed, which can increase the processing power and help make a computer run faster. Software programs that require many calculations to function smoothly can operate faster and more efficiently on multi-core 64-bit processors, for the most part.
| **Feature | **32-bit OS | **64-bit OS |
|---|---|---|
| Memory | Maximum of 4 GB RAM | Maximum of several terabytes of RAM |
| Processor | Can run on both 32-bit and 64-bit processors | Requires a 64-bit processor |
| Performance | Limited by the maximum amount of RAM it can access | Can take advantage of more memory, enabling faster performance |
| Compatibility | Can run 32-bit and 16-bit applications | Can run 32-bit and 64-bit applications |
| Address Space | Uses 32-bit address space | Uses 64-bit address space |
| Hardware support | May not support newer hardware | Supports newer hardware with 64-bit drivers |
| Security | Limited security features | More advanced security features, such as hardware-level protection |
| Application support | Limited support for new software | Supports newer software designed for 64-bit architecture |
| Price | Less expensive than 64-bit OS | More expensive than 32-bit OS |
| Multitasking | Can handle multiple tasks but with limited efficiency | Can handle multiple tasks more efficiently |
| Gaming | Can run high graphical games, but may not be as efficient as with 64-bit OS | Can run high graphical games and handle complex software more efficiently |
| Virtualization | Limited support for virtualization | Better support for virtualization |
**Advantages of 64-bit Over 32-bit
- Using 64-bit one can do a lot of multi-tasking, the user can easily switch between various applications without any Windows hanging problems.
- Gamers can easily play High graphical games like Modern Warfare, and GTA V, or use high-end software like Photoshop or CAD which takes a lot of memory since it makes multi-tasking with big software, easy and efficient for users. However, upgrading the video card instead of getting a 64-bit processor would be more beneficial.
**Note:
- A computer with a 64-bit processor can have a 64-bit or 32-bit version of an operating system installed. However, with a 32-bit operating system, the 64-bit processor would not run at its full capability.
- On a computer with a 64-bit processor, we can't run a 16-bit legacy program. Many 32-bit programs will work with a 64-bit processor and operating system, but some older 32-bit programs may not function properly, or at all, due to limited or no compatibility.