Differences between the T420i and the T420

Hey everyone,
I currently own a X61. I have been thinking of buying a T420, and right now, with the ongoing 4th of july sale, plus a corporate discount, it's a pretty good deal.
The only problem I have is that I don't quite understand what the difference is between the T420i and the T420. As far as I can see, the only difference is the processor (i3 vs i5), but other than that the configuration seems the same.  I have looked at the tabook, and I don't see any significant difference. Still, the the difference in model nomenclature (that pesky "i") bothers me.  Am I missing anything here? 
Any help will be greatly appreciated. 
Robert
X230
x200
T410
X240
TP Tablet 2

hey rmendoza58,
i would recommend calling our sales team via http://www.lenovo.com/contact/us/en/ .
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