30 Frames Per Second and 60 Frames Per Second refer to the number of images a console/computer throws onto the screen every second (as any video you ever see is just a series of images rapidly displayed to trick the brain into seeing motion).
30 Frames Per Second is fine for almost any console game as long as the game is consistently locked at 30FPS. Most PC gamers would prefer higher than 30FPS especially for shooters.
Consoles have to have one standard set of specifications so that developers can make games for them with some surity. So while consoles might start out powerful, PC's quickly outstrip them as parts are upgraded over time, but consoles stay the same until the generation changes.
A CPU is a Central Processing Unit that does an awful lot of the hard yards in computing and making the game you're playing come together. A GPU is a Graphics Processing Unit that has more to do with processing and displaying the image that the CPU prepared.
The CELL is just a type of CPU.
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