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Called RAM that you can access any location it randomly and quickly

What is RAM?

main memory or RAM (Random Access Memory, Random Access Memory) is where the computer stores the data that is used in the present moment. Storage is considered temporary because the data and programs remain there while the computer is turned on or is reset.
Physically, consist of a set of chips or chip modules normally connected to the motherboard. The memory chips are black rectangles soldiers often go in groups some chips with "pins" or contacts:

then submit the types of RAM and have evolved as each of them:

types of RAM MEMORY SIMM (Single In-line Memory Module)
ü exixte 2 TYPES OF ( 30 pins and 72 pins)

• 30-pin SIMM MEMORY
  Coast Ø 30 contacts and 8 bits
  handled or used in computers
  Ø 386 and 486 came in modules 256kB, 1Mbit or tension
  5V supply is

• MEMORIASIMM 72-pin Ø Coast
  72 contacts and drives to 32bits.
  or used on computers 484, 586, K6-II, K6-III, Celeron, Pentium, Pentium II. Ø
  4MByte capacity is up to 64MByte.
  Ø Work with a voltage of 5V.

• MEMORY DIMM (Dual In-line Memory Module)
  Ø consists of 168 contacts and 64 bits.
  or available capacity to 512Mbytes 8Mbytes.
  Ø Work with a voltage of 3.3V and 5V.
  Ø With a memory bus speed that ranges from 66MHz to 133MHz.
  or begin to be used with the Pentium II and its use goes to the output of the Intel Pentium 4 processors and AMD Athlon XP
  
  
  

• MEMORY DIMM DDR (DOUBLE DATA RATE) Double Data Rate
  Ø has 184 contacts in the same physical size of 168 contacts
  Ø Work with 2.5V and 1.8V voltage.
  Ø With a memory bus speed from 100MHz to 200MHz
  or begin to be used with the output of the Pentium 4 and XP
  
Thlon

• MEMORY DDR2 DIMM 240-pin
  Ø has 240 pins and doubles the amount of data using 2 clocks. Ø
  speeds from 400MHz to 667MHz. Ø Ability to 1GByte
  . Ø
  have bus speeds of real memory from 100MHz to 266MHz.
  or consumption of these reports is between 0 and 1.8 volts.
  
  

• 
  DDR3 MEMORY DIMM has 240 pins Ø just the DDR3 DIMM.
  Ø Although not compatible with DDR2 memory. Ø
  memory bus speed from 800MHz effective 2000MHz. Ø
  consumption between 0 and 1.5 volts.
  Ø A maximum data transfer rate of 15.0GB / s.
  

CACHING
is used to facilitate a transfer even faster than the processor instructions and data that is used to improve process flow (how fast a system computer can do the job). Like RAM, the cache is an area of \u200b\u200bhigh-speed storage for program instructions and data, but shaved 10 times more than RAM. With only a fraction of the capacity of the RAM, the cache only contains instructions and data processor is likely to soon require
There are two types of cache memory: Memory
Ø L1 Cache L2 Cache
Ø

Conclusion:
ü As we have seen the emergence of electronic computers is fairly recent, and has had a rapid advance. So much so that today the competition between enterprises producing computers to rise to the emergence of new models with very short periods of time, which are sometimes of months. Causing an increase in processor speeds, storage capacity, speed of transfer of the buses, etc.. Ü
Currently the market is taking place again, because they have appeared very fast processors, which work speed of 1 GHz