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Short answer: CISC instructions consist of several RISC instructions. That makes CISC slower (per instruction) compared to RISC.
Compared to other architectures, CISC processors have relatively powerful instructions, which used run so called microprograms. For each instruction, the corresponding microprogram has to be fetched and executed, which is considerably slower than just using 'real' hardware instructions (compare RISC). According to wikipedia, microprogrammed processors are no longer common. Instead, a special unit resolves CISC instructions to RISC instructions.
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Diff bw risc and cisc?
CISC stands for Complex Instruction Set Computer. CISC chips are relatively slow per instruction,but use little instructions RISC stands for Reduced Instruction Set Computer. A fewer, simpler and faster instructions would be better, than the large, complex and slower CISC instructions. However, more instructions are needed to accomplish a task. It's easier to write powerful optimised compilers, since fewer instructions exist.
What do RISC and CISC stand for and what are the differences in practice?
RISC stands for Reduced Instruction Set Computer CISC stands for Complex Instruction Set Computer RISC processors have a simpler set of machine instructions than CISC processors, but are intended to be more efficient and flexible in processing programs and data. Because of the reduced instruction set, RISC processors demand more effort on the part of the compiler (not the end user) and use longer machine language programs. RISC processors are more flexible in the sense that they are not as preconfigured in how they process programs and data. CISC microprocessors actually preceded RISC microprocessors and were derived from microcontroller based mini-computers such as the HP2100. See the Wikipedia entries on "Complex Instruction Set Computer" and "Reduced Instruction Set Computer" for more.
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