Render setting might not necessarily help with that.

When you texture an object, the seams may look fine in the preview because it often has lower texture resolution, and doesn't show bumps, displacement maps and so on..

In my experience, very visible texture seams in render is usually poor texture work rather than a renderer problem.. :) Of course there may be other issues that can cause this too?

Are you using your own textures, or are you using someone else's product?