May you see some bottlenecking with the Intel® Pentium® G2020 with the HD7850 or GTX 650ti? Yes you might but it most likely is small enough that it wont make a lot of difference in your overall performance. The issue is for at least for the Intel Pentium and the Intel Core™ i3 they are both dual core processors and as such they maybe limited on their performance on heavy multi-threaded applications.
Thanks. I play at a small resolution (1280x1024). Should i save the money and put them into other parts ex. get more ram?