In our recent Roadmap 2016-17 blog, Creative Director Jay Crowe briefly mentioned the 64-bit client of the game. While we plan to publish a separate OPREP on the topic closer to its Dev-Branch release, some details can already be shared now. Richard Biely, one of the programmers responsible for the development, throws some of the facts on the table:
"Being able to utilize virtually all your system's memory, the performance of Arma 3 should become a lot more consistent. With the ability to cache a huge amount of data, less loading is required. This translates into less work for the game to do and ultimately into more fluent gameplay.Rather than introducing a miraculous framerate increase, an improvement in the performance will be most visible when playing the game with a long view distance. The amount of data to cache is rather large in this case and the game will benefit greatly from an increased amount of available RAM."
Naturally, such a great change comes with some limitations. Players will not be able to run 64-bit Arma 3 on 32-bit Operating Systems, or 32-bit only CPUs.