Central Processing Unit
CPU
What is CPU
CPU is the brain of the computer and has several parts. It is used to execute and fetch instructions stored in the RAM. The CPU can perform many commands a second, measured in HZ, so 1 KHZ would perform 1000 operations a second, but the best computer on the market at the moment has 87433GHZ, which is equal to 8,743,300,000 simple commands a second. When a computer is turned on, the OS is the first thing to activate, shortly followed by the RAM. Then the C.U (Control unit) and the M.C (Memory Controller) deal with any outside devices like mice etc. Then the CPU Fetches commands from the cache, a volatile small memory device, or frm the register. Then it decodes the command using the ALU (arithmetic Logic Unit). Finally it executes it using the register again.
ROM VS RAM
RAM is random access memory and is used for transporting commands from one piece of hard were to the other. So as you could guess the more RAM the better when it comes to intensive programs (computer games, hd videos and so on), so for example 4 bits of RAM is ok, 8 is good, 16 is pretty brilliant and 32 i god like. ROM however is different, it stands for read only memory, and is stored in the hardware of a computer. It contains the sequences that can't be changed, because they are vital for a working computer. This contains stuff like the boot up system, because it is still needed when the computer is of because it needs to start again. ROM can not be changed.
SRAM VS DRAM
SRAM mean Static Random Access Memory, and is more expensive then DRAM because it is better in general. It can store more memory then DRAM and is called static RAM because it does not move. It mostly helps the cache memory. DRAM means Dynamic Random Access Memory and is cheaper then SRAM because it does not constantly stay, it is being refreshed over 1000 times a second, because it loses data very quickly when power is reversed.
RAM
Random Access Memory
ROM
Read Only Memory
MAYBE DRAM
POSSIBLY Dynamic Random Access Memory