Hi Ferry man,
it´s simple...more capacity...more usage of resources...
I see no improvement on my 64 bit computer compared to my 32 bit system. The start is not faster and the games are not faster as well.
Up to now I had no problems with the games. The games of today are playable but there are some problems with older games. I am no computer expert but as an example, Age of empires 2 can be installed but has graphic problems (should be able to remove these problems as I read so far).
Lord of the Rings, battle of middleearth...is playable without problems on my computer, however, there are big problems with multiplayer with another computer who has no 64 bit. It was not possible so far (unfortunately!!!)...and that is the point where I regret it a bit the 64 bit systems...because I see no higher performance compared to my other computer (similar equipment).
Cheers
Ingo