GTA V settings exceeds my GPU limit but it runs very smoothly

[Puksion]

As the title said, im wondering how can i play games at higher details than i should if my GPU is only 1gb, in GTA V details are using 2gb, thats twice of my GPU and still runs very well at high setting. Can someone explain me why ?

I made a 2min video showing my spec and gameplay:

Video

I have
amd 8350
nvidia gtx 460se
8gb ram

 

[Rhezner]

get fraps and check your fps, different people have different ideas of smooth framerate

 

[Puksion]

Im runing game at 74hz adn gsync turned on, its very smooth, the fps doesnt drop at all, im just wondering why, cuz my gpu isnt that much strong, beside that i play games at full hd monitor

 

[Rhezner]

that card does not support g-sync

what is your resolution. If it is 720p then that is not surprising.

what settings are you running at?

they overestimate the memory needed as well

 

[Cons29]

what settings are you using? what resolution? and sorry if i cannot watch your vid, but what fps are you getting?

 

[Puksion]

Sorry mistake, I thought "Vsync", all settings are to high, and i run 1920x1080, now you can see video, i forgot to set to "Public". Sorry if im boring, but I'm just curious why it behaves as if I have a gpu of 300e, not some sh*ty 1GB gpu