Bullet PC did an "autopsy" 
of two GeForce4 Ti4200 video cards with different RAM memory quantities. Heres a slice:
"When it comes to the decision of going budget you have to look at what you
will be using your video card for. Do you occasionaly play a game or two? Do
you want to play the latest games but dont want to fork out the extra cash
for the high-end video cards? Its a tough decision, but my report suggest
to spend the extra little on the 128Mb variety. I would even suggest in
looking at a Ti4400 GeForce 4."
Direct link: Ti4200 Comparison 64MB vs. 128MB
