Here charged maybe this will help you make a decision same settings as my 3.6 gig run with 2x4850 19706 score


4870/4850 Hybrid
Both cards are at they're max stable clocks, not worth the price diff in my opinion for only 400 points and taking to consideration that the 4850's have more potential if CCC limits were gone.
http://service.futuremark.com/compare?3dm06=9927135