Section 1.4

SubSection 1.4 CPUs Unit 4 Topic A
Explain the purpose and characteristics of CPUs and their features

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Types of CPUs

-CPU stands for central processing unit; it is the "brains" of the computer. It's a chip that processes instructions,manipulates data, and controls the interactions of the other circuts in your computer. A CPU has three components: a control unit, one or more execution units, and registers.

  • AMD

    • stands for Advanced Micro Devices
    • typically uses Socket A (also known as Socket 462)
    • list of AMD sockets
external image 290px-Socket_462.saa.jpeg
external image Socket+775-1.jpg


  • an Intel technology that enables a single processor to execute two streams of instructions at the same time,as if it were two processors.


  • single computing component with two or more independent actual processors (called "cores"), which are the units that read and execute program instructions
external image multi_core_CPU_1_small.jpg

  • Dual core

    • two separate physical computer processors in the same on the same component
external image p4s.jpg
Difference Between Dual Core & Dual Processor
  • Quad core

    • a processor with four "cores". external image quad_core.png

On-Chip cache

Video on how Cache works
    • cache is a type of RAM, used to make access to memory faster taking some of the load off of main RAM
  • L1

    • this cache is built into the processors execution unit,giving the cache a zero-wait state.
    • L1 cache is very small which allows it to be very fast
  • L2

    • this type of cache is built onto the motherboard.
  • L3

    • specialized memory that works hand-in-hand with L1 and L2 cache to improve computer performance.
    • L3 cache can be far larger than L1 and L2, and even though it’s also slower, it’s still a lot faster than fetching from RAM
    • L3 is typically built onto the motherboard

  • Data bus

    • bus refers to a communication pathway within a computer
    • the data bus transfers data between the CPU and RAM

Created by Mailisa
Edited by Mailisa, JJ