Hi there!

I have been using Linux for a while, so now I would like to start going through Debian.

My question is:

What's the difference between Debian and Knoppix? (obviously the question focus is about what Knoppix doesn't have that Debian does)
Is there any performance difference? (I would like to run some high-resource apps)
What can you do with Debian and not with Knoppix?

... and finally: Is there any x64 version? (I am a AMD64 owner)

Thanks!