"The game's built in voice chat does not currently work in the 64-bit client."

Does anybody use it? I've never seen a PUG use it, and guilds tend to use Vent/Mumble. It seriously needs a lot of work if Blizzard really intends for us to use it.

"and a 64-bit system with limited memory (say, 4GB of RAM or less) may actually see decreased performance due to the increased memory usage of 64-bit programs."

I disagree. The increased memory usage will be plenty offset by being able to use all 4 GB rather than about 2 GB or so. A 4 GB system should be sped up, rather than slowed down. The actual increase of memory usage should be very minimal.

If you're *not* gonna be able to use a larger pool of memory because of the 64 bit compatibility, don't bother. The whole purpose of it is to be able to use more of your memory.

"Systems with more memory, however, will be able to cache more program data in RAM. This should help speed up things that require large reads from the hard drive, such as changing zones, and may increase stability for those who run lots of addons."

Changing zones should be faster, but to be honest addons don't really take up that much memory. Even with a lot of them installed, I doubt they are taking up a lot of memory.

One thing that will very likely benefit is when there's lots of players in one place. I remember that Dalaran used to crash my system with out of memory errors even though my system was far more than 4 GB (6 GB, later upgraded to 8 GB). Thankfully, Cataclysm resolved that by encouraging players to spread out a bit in the major cities, but I imagine it's still possible. With a 64 bit client, Dalaran would have run fine.

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