Will i be able to play high end games with a dual core?

A lot of game companies know that most of their customers don't have much money to spend on computers and besides, they would rather you spend your money on their games. My dual core ran Crysis on full graphics beautifully with just a nvidia 7600. You should be fine with what you have.

If anything, go into the graphics menu of your games and shut off crazy stuff like anti-aliasing, dynamic shadows, and any other option that you have no idea what it does. Particle effects and reflections kill game engines, so if you can turn those down the game will run much smoother.

A dual core is not among the powerful CPU's these days, and the dual core will become obsolete soon since it's not last long... these days I would really go for at least a Quad Core CPU Amd Phenom CPU's, or I would recommend the I7 2600k since it's really cheap and it's blazing fast... but if your not tight on cash then get the I7 990X...

You would play exceptionally with a dual core.

If I were you, I would go for a nice budget Quad Core AMD Phenom II X4 965 BE @ 3.4ghz which is what I am using.

You must be competent not to handiest play, however maintain it at the greater graphical settings... i am caught on a a million.8ghz processor with handiest 2gb of RAM, I need to play the whole thing on the lowest settings... :/

It should be able to play BF3 on high, but idk what your GPU is. My 2.8 dual core runs every game maxed i have played with 8800GT.