no it will not bottleneck i have almost the same built i would suggest to buy either 7850 or 7950 not 7870 or may be if you have more money than 7950
Any reason why I should prefer 7850 over 7870? 7870 is clearly better than 7850 in terms of specs. I don't mind paying a bit extra for it. And regarding 7950, I can't afford it since it costs around $600 in India.
what resolution you are planning to play & what games??
Are you not interseted in phsyx games ??
I'll be playing at 1080p. Mostly for Battlefield 3. And also for the new games releases like Borderlands 2, Dishonored, Witcher 2, etc. Borderlands 2 makes very good use of Physx but I don't want GTX 560 Ti just for that since 7870 is much better at almost every game than it.