Check out
http://silentpcreview.com for lots of good
hardware reviews
with a focus on silentness. For a gfx-card I would recommend to stay
away from NVidia and Ati, instead go for a Matrox G400/G450/G550.
There are several fanless nvidia and ati cards. I have a fanless
nvidia fx5200, and I know that there are some fanless ati 9600.
Performancewise, they beat the matroxes, and they are easier to
find.
maarten