Why woul Intel release two cpu's like this that are so close to each other in performance?
It seems redundant. I did notice that the 520m is listed as embedded where the 540m is not. Maybe that has something to do with it.
I would suggest you to ask Intel experts directly on 26th Feb 2010 through live Q&A. They are running Live Chat session on Intel Technologies, visit the link and register yourself to get most out of Intel Technologies at http://www.intellivechat.com/facebook.html