Hi all, I'm not really into agp specs and I need some help.

I've got a Ti4280(128mb - 8x) card, ok?
It is true that the games run slower if I set the card at 8x than 4x? why is
that?

Now about the AGP aperture size, I hear it's good set it at half of current
system memory. I have 768mb, so I put it at 512mb (rather than 256mb).
What's the best setting? and why?

Think only for gaming, ok? games, games and more games!

Thanks,
Vinicio