about RISC and CISC

Reduced Instruction Set Computer (RISC) CPUs were introduced by a series of companies that liked to keep the instruction sets very simple. This was due to the belief that the RISC architecture could make the microprocessor perform faster by incorporating many reduced instructions.
Intel and AMD chose to stick to the CISC (Complex Instruction Set Computer) architecture. CISC CPUs include a huge amount of instructions and lots of those could do some pretty complicated things. The RISC boys couldn’t imagine that Intel and AMD would be able to fabricate their own microprocessors using nanometer technologies that allow CPU complexities of more than 100-million transistors and get that intricate circuitry running at gigahertz rates. The scientific community remembers that it had to migrate from RISC CPUs to CISC ones, when the road of reduced instruction sets came to a dead end. Scientists realized that the CISC CPUs are cheaper, but still powerful and they eventually became supporters of this technology.

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