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Hope this helps:
http://www.techspot.com/review/458-battlefield-3-performance/page7.html
I vote 2100.
So an 7850 2gb, 8gb ram and the i3 2100 can handle bf3 with ease then?
I'm wondering the same thing. I'm thinking of moving from my i7 860 to i3 2100 (and Z77 board) for the lower temps and power usage, but I'm worried I'll take a massive hit in gaming performance.