Courtesy http://eu.battle.net/wow/en/forum/topic/3312962371
A 64-bit client is now available for use with Patch 4.3.2. Before being able to launch WoW in 64-bit mode you will need to download the 64-bit client for PC/Mac (using one of the links below), and unzip it into your World of Warcraft directory. Once you extract the files you can start the 64-bit client by opening the Launcher as normal (Run as Administrator if applicable), go into Options -> Game Preferences, and toggling the Launch 32-bit client setting. The game will display which version you are using at the bottom left hand corner of the login screen. ex: Version 4.3.2 (15211) (Release x64)
Build 4.3.2.15211
- PC: http://us.media.battle.net.edgesuite.net/downloads/wow-installers/live/WoWLive-64-Win-15211.zip
- Mac: http://us.media.battle.net.edgesuite...-Mac-15211.zip
**Important things to keep in mind**
- The 64-bit client is being distributed separately from the Retail version as it is not yet supported for use with World of Warcraft.
- Launching the game in 64-bit mode can only be done after patching the game to version 4.3.2, downloading and extracting the necessary files.
- The game’s built in voice chat does not currently work when using the 64-bit client.
- [Mac] The 64-bit Mac client does not currently support the in-game movie recording functionality.
- [Mac] The 64-bit Mac client iTunes' Remote feature does not work at the present time.
- [Mac] The 64-bit Mac client does not currently support the customized LCD display for the Logitech G15 series of keyboards.
- [Mac] The 64-bit Mac client is currently not supported on 10.5 systems. You will need 10.6.8 or later for this version.
Additional System Requirements:
- Windows XP Professional “x64 Edition” / 64-bit Windows Vista / 64-bit Windows 7 (latest service packs).
- Mac OS 10.6.8 or newer.
- Mac Computer with Core 2 Duo or better
- 2 GB or more of RAM.
If you encounter any issues while using the 64-bit version, please report your findings in this thread and return to using the 32-bit executable. In order to facilitate support when contacting Technical Support, please inform them if you are using the 64 bit client.
To remove the 64-bit client completely, delete the following files from your World of Warcraft folder:
Windows
Battle.net-64.dll
MovieProxy.exe
WoW-64.exe
Mac
World of Warcraft-64.app
Additional Information:
How to tell if you have a 64-bit operating system:
Windows: http://support.microsoft.com/kb/827218/
Mac: http://support.apple.com/kb/HT4287



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