CPU,ROM,RAM and Virtual Memory.

CPU,ROM,RAM and Virtual Memory.

1. CPU

   • The CPU is the brain of the computer.
   • The CPU carries out all the processing in a computer.
   • CPU stands for Central Processing Unit.
   • It carries out the Fetch, Decode and Execute cycle. FEC
   • it can be made up of one or more cores and each core has its own cache memory that is a lot faster than RAM.
   • The speed of the CPU is measured in Hertz (HZ).
   • The amount of cores in a CPU affects the speed. For example, quad core is 4x faster than a single core.

2. ROM

   • ROM stands for Read Only Memory.
   • It also contains BIOS which stands for Basic Input and Output System.
   • It contains the boot up instructions and the operating system (OS).

3. RAM

   • RAM stands for Random Access Memory.
   • It stores volatile memory that is lost when the computer is turned off.

4. Virtual Memory

   • It's part of the hard disc.
   • It is normally twice the size of the RAM.
   • It holds memory the RAM isn't using.
   • It is volatile memory.