Mod_ssl and how to reduce overhead

Hello, I am trying to plan a system that can handle 10k-100k users.

I am only using apache w/mod-ssl

What should I look at to reduce overhead of bandwidth/cpu/mem?

At what point should I look at ssl accelerators?

Should I definitly look at clustering?

Also.. I ahve heard about ssl session key caching, anyone know how much this 
will improve things?

Any good resources I can read?


thanks!
Lee 
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