Which to buy - a 32-bit or 64-bit PC?

There is now so much choice in the components installed in a desktop or laptop pc, it can be so confusing to buyers that they just make a choice on purely on price or the advice of vendors - advice that more often than not is provided by people who don't know what they are talking about.

To add to the confusion, you can have a 32-bit system or a 64-bit system. The PC's processor can be a 32-bit processor or a 64-bit processor, and the operating system, which is usually a version of Windows can be a 32-bit or a 64-bit version.

All of the latest processors from the two major manufacturers - AMD and Intel - are 64-bit and will run a 32-bit or a 64-bit operating system (Windows, Linux, Apple OS X). Note that a 32-bit processor cannot run 64-bit software, so it must use a 32-bit operating system.

If you're the average user whose computing needs don't require more than 3.2GB of RAM memory, the limit of a 32-bit operating system, that choice will do just fine. It is compatible with almost all software applications, and compatible hardware device drivers are easily available.

64-bit operating systems will one day be the norm as 32-bit systems are now. However, you should only choose a 64-bit system if the programs you plan to use in the future require a 64-bit system, or more than 3.2GB of RAM memory (i.e., you use 3D-rendering software, intense graphics, etc.). Otherwise, there are currently more drawbacks to running a 64-bit system than there are advantages. The non-availability of 64-bit device drivers for peripherals such as printers, routers, scanners etc., is the major drawback. A 64-bit operating system cannot use 32-bit device drivers, they must all be 64-bit. Note well that although a 64-bit processor can run both 32-bit and 64-bit software, a 64-bit operating system can only run 64-bit software, so your old 32-bit applications will have to be upgraded to their 64-bit versions.

The typical computer user is unlikely to notice any gain in performance from a 64-bit system. Visit the Using Windows Vista for more information on the 64-bit versions of Windows Vista. Only Windows XP Professional Edition has a 64-bit version; Windows XP Home Edition is only available in a 32-bit version.

More information on the 64-bit versions of Windows XP/Vista is provided further down this page.