Because having 60 FPS while having good graphics require more power and weight on the system than to have 30 FPS ,its a limitation issue, not anything else.
on consoles, if you want 60 FPS you have to sacrifice a bit of the graphics , because the console wont handle it and will result in crashing or loss of FPS.
as for CPU and GPU, to put it simple and to understand it more.
CPU = the system's Calculator, it calculates every bit of the things that happen in the game, such as AI
GPU = the systems Graphical memory , the better the GPU the better the textures
the Cell is a CPU model.
this is a prerendered ( Or in other words CGI)
This is In Game
Difference is the CGI one is premade , its just a video file that plays when you reach some point in the game, while the non CGI one is a series of animations in a "Cut Scene" that is made on the fly by the system.
I live for the burn...and the sting of pleasure...
I live for the sword, the steel, and the gun...
- Wasteland - The Mission.
