How to get better graphics for gaming (pre-built computer)

[Anonyymi90]

Hello!
I was wondering how to get better graphics for my games on pc (i play something like far cry 3, bf4 and bioshock infinite etc.)
I can play the games without problems,but if i want to play without the games being "slow", i usually have to set the graphics to 'medium' or 'low'.
So basically what i am asking is, what should i do/update, to be able to play my games on 'high' or even 'ultra' graphics settings?
My computer is HP p6-2469eo and specs are:
Processor: Intel Core i5-3350P CPU @ 3.10GHz
Memory: 8 GB
Hard Drive: 1000 GB
Graphics card: NVIDIA GeForce GT 630 (and DirectX 11)

PS. If i should change my graphics card, feel free to suggest good ones (if they fit to my pc ofc), even if they are little bit pricey!
Thanks for your answers!

 

[TheIronDUke]

Well depending on your budget there are tons of good cards out there. The 650 ti is great for 150 dollars. The 760 is great for 250 dollars. The 770 is great for about 350 dollars. Go to newegg or amazon and just look up cards. Make sure to get a second opinion though before you buy.