Difference between CISC and RISC | CISC vs RISC

 Difference between CISC and RISC

CISC: Complex Instruction Set Computer

• Instruction size and format: Large set of instructions with variable formats (16-64 bits per instruction)
• Data transfer: Memory to memory
• CPU Control: Most micro coded using control memory (ROM) but modern CISC use hardwired control.
• Instruction Key: Not register based instructions.
• Memory access: More memory access
• Clocks: Include multi clocks
•  Instruction nature: Instructions are complex and simple.
• Examples: Intel architecture, AMD

RISC : Reduced Instruction Set Computer

• Instruction size and format: Small set of instructions with fixed format (32 bit)
• Data transfer: Register to Register
•  CPU Control: Mostly hardwired without control memory.
•  Instruction Key: Register based instructions
•  Memory access: Less memory access
• Clocks: Includes single clock.
•  Instruction nature: Instructions are reduced
•  Examples: SPARC, POWER PC