RAM is a very touchy subject and can vary greatly depending on what you do
with your computer. My system has 1.5GB of RAM and I never see the usage go
above 50% even when I have Windows Media Player running, Internet Explorer,
five or six instances of paint open, and Microsoft Digital Image or Adobe
Photoshop all running at the same time. So for me, 1.5GB runs Vista without
a hitch. You could probably do all that well with 1GB also, but probably
not much below a gig. If you're the kind that just reads e-mail, surfs the
web, plays solitaire, and the like, 512MB probably would work fine. Now if
you're a heavy gamer, I'd say that 2GB would be a good place to be. And
you're also asking how much video RAM for good performance... Do you want
to know how much video RAM for running Aero Glass well or gaming? For Aero
Glass, if you're running at a resolution around 1280x1024 or lower, then
128MB should be fine. If you're running at 1024x768 or lower, you might
even do fine with the bare minimum of 64MB. If you're going to run higher
resolutions than 1280x1024, I'd get 256MB of video RAM. If you do light
gaming - in other words, occasional gaming where you're not playing games
every day and play older games such as Quake III, 128MB should not be a
problem. If you're doing "newer" games starting with Doom 3 on Vista, 256MB
should be fine.