best gaming experience

[jitu sinha]

I am planning to upgrade my pc for the best gaming experience.
My current pc specs
Intel core i3 2120 3.30 ghz processor
4 gb ddr3 Ram
500 gb hdd
180W smps
(No graphics card)
I have a branded pc of lenovo.I have h330 7780 1 JU.Go to the link for more information.
http://www.lenovo.com/shop/americas/content/pdf/system_...
So what are the components that i should change and add to my pc to make it efficient for gaming.Also provide me the extra money which i have to spend for adding or changing the components. I want to run all the latest games in high settings.In case of gpu Rs 12000 is my maximum budget.I am also ready to change my processor or motherboard if required.

 

[i7Baby]

Your CPU, your ram, add a graphics card, get a better power supply

12000inr won't get you "the best gaming experience"

 

[jitu sinha]

then how much money i have to spent.i am ready to spent 12000 for only gpu.

 

[i7Baby]

How much for the whole PC?

 

[jitu sinha]

Rs 25000 is the max i can spend for my current pc.