Dave Georgeson has recommended that EverQuest Next: Landmark alpha testers use a 64-bit operating system due to the game not yet being optimized. The statement was made via Georgeson's Twitter account.
Hey #EQN Trailblazers! Heads-up. 64-bit OS is highly suggested for Alpha. 64-bit lets us access all your memory. Alpha isn't optimized yet.
— David Georgeson (@DaveGeorgeson) January 17, 2014