Upgrade ready built pc

[Kenetic9]

So ages ago I brought a ready built pc and I don't really know much about PC's so I just brought an average PC. Recently I began to play overwatch (and other high demanding games) and at epic video settings I only get 30fps when I lower it to low it goes up to 45-60fps. I was wondering how I could boost the frame rate and be able to play the highest settings in any game like bf1 or wd2. Here are my specs:
Processor: Intel Core i7 4770
Graphics: Nvidia George GTX745 4GB
Hard Drive: 2TB
Memory: 12GB DDR3
I've been told that the graphics card needs changing but I need other people to confirm it. Any recommendations or anything else?

 

[MrN1ce9uy]

Hello,

Yes the graphics card needs to be upgraded if you want better performance. It is the bottleneck of your system.

1.) What kind of power supply do you have?

2.) What is your budget?

3.) What resolution is your monitor?

 

[captaincharisma]

if it is a pre built, brand name PC you may have to get a better power supply to handle a modern Graphics card