The Central Processing Unit when you look at the PSX is just a RISC processor. RISC represents paid off instruction set computer, and ensures that the guidelines and computations done by the processor are easier and fewer. Additionally, RISC chips are superscalar — they are able to perform numerous guidelines in the exact same time. This mix of abilities, doing numerous guidelines simultaneously and finishing each instruction faster since it is easier, enables the Central Processing Unit to execute much better than numerous potato potato chips having a faster clock rate.
The CPU, graphics and audio processors are combined into a single application specific integrated circuit, or ASIC to lower production costs. In other words, the ASIC is really a chip that is customized to handle every one of the elements that could otherwise be managed by three separate potato chips.