What’s the difference between 32 bit and 64 bit operating systems?
This guide will take you through the differences between a 32-bit operating system and a 64-bit operating system and the maximum amount of ram that your operating system can support. The majority of home computers today run a 32-bit operating system and can support up to 4GB of computer memory. Newer computer models have the ability to support over 4GB of RAM. Below is a diagram that shows how much RAM each operating system can support. Use our Memory Configurator to find 100% compatible computer memory for your computer system.

32-Bit
- Can support only up to 4GB maximum of RAM
- Cannot run programs designed for a 64-bit OS
- More commonly found in older home computers where processing power and applications are not mission critical
32-bit OS Examples
- Windows 95
- Windows 98
- Windows ME
- Windows 2000
- Windows XP Home
- Windows XP Pro
- Windows Vista Home
- Apple OS 9
- Apple OSX Jaguar
- Apple OSX Panther
**It is common for a 32-bit OS to only utilize and display less than 4GB of RAM even if 4GB is installed. This is not an issue with 64-bit computing.
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64-Bit
- Supports total RAM densities over 4GB
- Runs both 32-bit and 64-bit programs
- Previously more common in servers and mission critical setups requiring a great deal of RAM; now equally common for home applications
- Replacing 32-bit systems; most new systems have 64-bit capable processors
- Although a system utilizes a 64-bit CPU, it cannot fully take advantage of its performance without a 64-bit OS
64-bit OS Examples
- Windows XP Pro 64
- Windows Vista 64 (Home, Business, and Ultimate series)
- Apple OSX Tiger
- Apple OSX Leapord
- Linux Distro (All Versions)
- Unix
64-bit CPU Examples
- AMD Athlon 64
- AMD Turion 64
- AMD Phenom
- Intel Core 2 (Duo and Quad)
- Intel Dual Core
- Intel Core i7
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