If you aren't into any audio editing, or 3D modeling, and graphics design you really have no need for beyond 4gb of ram.
4GB is the standard now, like 2GB used to be back when 4GB was for high end users.
Most high end users will go beyond 4GB to 6-8GB. I have 6GB because I have triple channel slots.
Either way, benchmarks for the 7470M aren't really out. At least not on notebookcheck.