Cpu + Gpu combination...............?

1366x768 is not very high, thats low settings, medium is 1080x1900 i think. All those graphics cards are wonderful, will run BF3 games on high. Battlefield 3 is the hardest game to run right now by the way. If i were you i would get the HD7850 as i checked reviews and everyone says the HD7850 is better than the GTX650 for price and better than the HD7770 as the name might suggest. But i would not use an i3 for gaming, just no. i5 or AMD FX 6 or 4 core. I would get either the FX-4170 or FX-6200. I have used a FX-6200 with an HD7770 and it runs beautifully but a FX-6200 with an HD7850 would be just delicious. Using an AMD graphics card and an AMD CPU give you a few more featurs than AMD and NVidia or Intel and AMD GPU. If your budget allows though you could get an i5, either 3550 or 2500K which is supposed to be the best and most popular gaming CPU .And i am assuming you are Indian,so am I, be proud of your PC boiii :-D

All combinations above suck. Where you get a good processor the graphics card is low end and the other way around.

The first one has the best processor with a low end graphics card, the second one has the best graphics card with an AMD "Faildozer' processor.

The third one is the most balanced.

As they are listed, best option would be number 3, with the i3-3220 and HD 7850 card.

In any case, DO NOT GET AN AMD processor, they are not good for gaming, Intel is much better.

The best possible combination would be Intel Core i5-3550 with GeForce GTX 650 Ti. Get that one if you can.