Actually, a graphing calculator does the same work as a regular one, which means that there is an installed program that provides the user with calculations. However, the tasks can be more difficult for a graphing calculator. Thus, the processor is more complicated.
The main challenge for graphing calculators is to draw the solution of a calculation, particularly, a graph or diagram. To be more clear, there are installed formulas, which are designed not only to calculate, but to create a graphical picture based on the given data. That is why these operations require more memory and a brain that can process the data – the processor.