Frame-rate issue

Hello, it's me having technical difficulties again. I recently bought a new computer to run BeamNG and similar games at higher FPS, but it doesn't really run them much faster than my old potato. However, if I press shift-F1, it says I'm running at 1440 FPS, which is about 80 times faster than it's actually going. I really want to be able to run this game at an acceptable framerate, as some maps are downright unplayable right now. Does anybody know why my computer is unable to run BeamNG well and how I could fix it?
Thanks!
Specs:
Desktop computer
8 GB ram
Intel core i5-3570k CPU @ 3.40 GHz 4 cores

• Nvidia Geforce GT 620 2GB VRAM

 

Ingame, press 'k' and your FPS is in the top left of your screen.
1440 is the physics engines FPS.

 

Oh, okay.
When I press k, though, it is always at 25 FPS no matter how laggy it is. I estimate getting about 20 FPS on DRI and 40 FPS on the empty grid. Pretty much just like my old computer.

 

You have a nice CPU and a crappy GPU. It's like having a Ferrari with an 80 hp engine.

 

Okay, should I look for a Nvidia Geforce GT 680 or try a different type of GPU?

 

For nvidia's desktop GPUs, the first number denotes the generation, and the second denotes the model. So yeah, a 680 would do muuuch better, assuming your PSU can put out enough juice.

 

Not that a GTX 680 or 780 wouldn't be great card but they are very expensive. If you don't plan to use screens with resolutions higher than full HD some cheaper graphics cards should be decent enough, cards like the AMD Radeon HD 7870 or 7950 or a Nvidia GTX 660 ti or GTX 760 will run Drive and about every other game fine while saving you quite some money.

You should have informed yourself better before you got that PC, a i5 3570k together with a GT 620 is really a bad combination. Most probably it was advertised as "2GB Gaming graphics!" or something like that to trick people into thinking it would be a good deal :\

 

Alright, do you think I should go for a GTX 660 ti?

 

In most cases the nvidia gt graphics cards are just as bad as integrated. So what you want is a gtx. gt=ms office, gtx=games in less accurate terms.
The first number is the generation or how old the card is, each new generation is faster than the last. 40% faster per each generation is a reasonable estimate. or so Nvidia likes to tell us, most of the time i find this to be untrue. source: http://i.imgur.com/rHrkR.jpg
The second number is how fast it is in that generation a gtx 770 is faster than a gtx760. This bit is pretty simple.
The third number is normally 0 , there is sometimes a 5 in laptop gpu's. If it has "TI" after its name then it is a slightly faster version of the card. A gtx660ti is faster than a gtx 660.

AMD also make GPU's and they use a similar naming system.

A good way to pick a card is decide a budget, say for example 200 (insert currency) and see what you can get for that, then look at review websites to see if the card is in the right ball park for the performance you need. If not then adjust your budget slightly. Then you need to look at which brand of the card you want to buy. Many different brands do different versions of each card. Here are a couple companies:
ASUS
GIGABYTE
MSI
EVGA
and many more (for some reason they all love to write their names in caps)
But review websites will go a long way towards helping you out, just make sure you look at a couple. If you say how much you are willing to spend and in what country it would go a long way to helping you out.