yes it will bottleneck like crazy!!
I had a dual core e6500 3.0ghz and a gtx 560 ti combo and it did worse than my mate's q9650 and a 9600gt combo. A 9600gt did better than a gtx 560 ti superclocked!!! talk about bottlenecks!
I'd suggest you to change your mobo/cpu to AT LEAST an intel i5 2450/h61 mobo. Could cost you less than 270. And then put whatever gpu you want in that system. But DO NOT make the same mistake that I did and put a gtx 670 along with a amd phenom 2 cpu. They wont get along well.