The main reason for this is that I'm trying to run Star Wars: The Old Republic but run constantly into single digit frame rates. My graphics seems to suffice, but even at low settings I get crappy FPS.
Somewhere I read that increasing the amount of RAM to 3GB+ would greatly help, and I believe it will. One reason is that when loading and exiting the game (particularly exiting), it takes several minutes. For example when exiting, it'll take at least about 5 minutes, which I'm guessing it's because it's deallocating that memory.
I wasn't exactly sure how much memory the 32-bit version could address. I don't care if it can't address the full 4GB, so long as I get more RAM available. I won't be able to use that last 0.5GB but I'll still be gaining 1.5GB of memory.