What's the difference between a 32- and 64-bit client?

In order to use a 64-bit client of WoW, you need to have a 64-bit operating system on your computer. The main difference between 32- and 64-bit operating systems (usually Windows) is that one deals with information in a more efficient way. Information in a 32-bit operating system is dealt with in pieces of information that are 32 bits wide, while 64-bit operating systems deal with information that is 64 bits wide -- double the alternative. With this larger bit structure comes better efficiency and the ability to use or "see" more RAM in your computer. 32-bit systems can only use 4 gigabytes of RAM and your 32-bit WoW client can only use 2 gigabytes, whereas the amount a 64-bit system can use is almost unlimited.
While we don't fully know exactly what improvements to the game will come with the 64-bit client, we can assume that more efficient processing power and the ability to stack more RAM for WoW to use might give some players a big frame rate boost and better performance. Lifehacker has an old article about how to tell if you have a 32- or 64-bit operation system.
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Just a quick tip for those of who may be stranded at work and thinking about World of Warcraft (which, during the day, is probably all of you?) I've never seen a link to this page (though we've 

A minor but important point: do not run the uninstaller to remove the Public Test Realm (PTR) client, just delete the PTR folder. Most people can find the PTR client inside the "WoWTest" folder, which resides in the "World of Warcraft" folder. More specifically, you should be able to locate the WoW Test folder in "C:\Program Files\World of Warcraft" or "C:\Program Files (x86)\World of Warcraft\". If you have MacOS X the "WoWTest" folder is stored in "Macintosh HD::Applications::World of Warcraft".






