Microsoft Windows Vista: How much memory is enough?
 

Do you need as much memory when you're running office applications as you do when you're gaming? How much memory do you need in Vista to game comfortably, and spreadsheet smoothly? Usually a hardware upgrade isn't required for a new operating system. Yet if you are planing to upgrade Microsoft Windows XP to Microsoft Windows Vista, it's almost impossible to avoid a PC overhaul. If the PC doesn't have enough RAM to satisfy Vista's intense thirst, you'll be the slowest thing on two wheels.
http://www.pcstats.com/articleview.cfm?articleID=2163

2 GB min, 4 GB recommended, 8 GB if you do video editing

4gb no good, no single application can use it, and 64-bit OS is waste of effort

Vista is a waste of effort if you don't go 64 bit. :D

XP 64-bit works better:p

2Gb is more than enough in my humble opinion :-p . On my pc atp 1Gb of memory is being used, so I still have 1Gb of memory to play with :woot:

Says you. :-p

I haven't even used it a week and I can do the same tasks in less time, without having a clue where x, y, or z setting was hidden. Vista finally fixed XP's hodgepodged Luna interface. Navigation around the OS / filesystem was finally done right.

3GB is good for those without the 64bit version.