Is RISC Better Than CISC?

Where might CISC vs RISC processors be used?

CISCRISCMemory-to-memory: “LOAD” and “STORE” incorporated in instructionsRegister to register: “LOAD” and “STORE” are independent instructionsSmall code sizes, high cycles per secondLow cycles per second, large code sizesTransistors used for storing complex instructionsSpends more transistors on memory registers2 more rows.

Which of the architecture is power efficient?

Explanation: Hence the RISC architecture is followed in the design of mobile devices. This discussion on Which of the architecture is power efficient? a)CISCb)RISCc)ISAd)IANACorrect answer is option ‘B’.

Does Intel uses RISC or CISC?

The current Intel processors have a highly advanced micro-op generator and an intricate hardware to execute complex instructions in a single cycle – a powerful CISC-RISC combination.


MIPS is RISC (Reduced Instruction Set Chip) architecture. Reduced (RISC) architectures tend to be simpler and have a small number of operations. Complex (CISC) architectures like x86 have more instructions, some of which take the place of a sequence of RISC instructions.

Is 8051 a RISC or CISC?

Yes, 8051 command set was design as CISC in mind. There are many points that makes difference between RISC and CISC processor and you can not judge just taking one point (like one instruction per cycle). Usually the biggest difference is that CISC can execute “memory-to-memory” instruction.

Is CISC faster than RISC?

RISC processors can be designed more quickly than CISC processors due to its simple architecture. The execution of instructions in RISC processors is high due to the use of many registers for holding and passing the instructions as compared to CISC processors.


AMD CPUs use a hybrid CISC/RISC architecture since their 5th generation CPUs (namely K5). Intel started using this approach only from their 6th generation CPUs on. The processor must accept CISC instructions, also known as x86 instructions, since all software available today is written using this kind of instructions.

Who uses RISC?

ARM, MIPS, Atmel AVR, PIC, most everything else that is intended for low-power and mobile devices, and IBM’s POWER machines are RISC CPUs. Many OSs, including Windows and various *nix flavors, have been ported to both RISC and CISC processors.

Why is RISC architecture best used for pipeline processing than CISC?

Because RISC instructions are simpler than those used in pre-RISC processors (now called CISC, or Complex Instruction Set Computer), they are more conducive to pipelining. While CISC instructions varied in length, RISC instructions are all the same length and can be fetched in a single operation.

What are the advantages and disadvantages of RISC and CISC?

RISC vs. CISCRISCCISCRISC has large code sizes, which means it operates low cycles per secondCISC has small code sizes, high cycles per secondSpends more transistors on memory registersThe transistors in a CISC processor are used to store complex instructionsLess memory accessMore memory access4 more rows

What is used to increase the apparent size of physical memory?

13. ______ is generally used to increase the apparent size of physical memory. Explanation: Virtual memory is like an extension to the existing memory. Explanation: This is a system command enabled when a memory function is completed by a process.

Does Intel use RISC?

The reason Intel uses a set of RISC-like micro-instructions internally is because they can be processed more efficiently. So a x86 CPU works by having a pretty heavy-duty decoder in the frontend, which accepts x86 instructions, and converts them to an optimized internal format, which the backend can process.

How does RISC V work?

RISC-V is a layered and extensible ISA which means a processor can implement the minimal instruction set, well defined extensions, and custom extensions for a given application. As long as the minimal set needed for a given application is implemented, that application will run on any compatible processor.

What is primary difference between a RISC and CISC processor?

RISC stands for ‘Reduced Instruction Set Computer Whereas, CISC stands for Complex Instruction Set Computer. The RISC processors have a smaller set of instructions with few addressing nodes. The CISC processors have a larger set of instructions with many addressing nodes.

Why does RISC architecture consume less power than CISC architecture?

In very small devices, RISC is more power efficient because the extra instruction decode logic in a CISC processor has a cost. But this is true only at the very low end. … The newer x86 chips have taken steps to power down sections that are not being used, so power efficiency has gotten better….

Why CISC is faster than RISC?

In common CISC chips are relatively slow (compared to RISC chips) per instruction, but use little (less than RISC) instructions. … Therefore 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.

Will RISC v replace arm?

ARM is the most successful microprocessor architecture on the planet, with its licensees shipping billions of chips a year.

Who invented RISC?

John CockeThe first prototype computer to use reduced instruction set computer (RISC) architecture was designed by IBM researcher John Cocke and his team in the late 1970s.