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.

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

Time to upgrade your computer memory? Find 100% compatible computer memory at EDGE!

McAfee Secure sites help keep you safe from identity theft, credit card fraud, spyware, spam, viruses and online scams BizRate Customer Certified (GOLD) Site