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RANDOM ACCESS MEMORY


ALL ABOUT RAM
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RAM (random access memory) is a place in computing device where the operating system, application programs and data in current uses are kept .  So they can be quickly reached by the device processor. Ram is much faster to read from and write to than other kinds of storage in a computer, such as hard disk drive (hdd) solid turned off.  Ram loses its data when the computer is turned on again,  the operating system and other files once again loaded into ram again.

Types of ram
Ram can be classified into two types
1.       Static ram   
2.       Dynamic ram

Static ram
Static ram is a random access memory (ram) that retain its memory as long as power is being supplied or any new new input enters.  Unlike dynamic ram, which stores bits in cellsconsisting of a capacitor and a transistor is in a latch circuit (flip flop).  Sram does not have to periodically refreshed.  Static ram provides faster access to data and is more expensive than dram.  Sram is used for a computers cachememory and as part of the ram digital to analog converter on a video card.

Dynamic ram
Dynamic ram is a type of memory i.e. Typically used for data or  program code  that a computer processor need to function dram is comon type of random access memory (ram) used in personal computer workstation and servers.  Random access allows the pc processor toaccess any part of the memory directly rather than having to proceed sequencially from a starting place.  Ram is located close to a computers processor and enables faster access to data than the storage media such as hard disk drives and solid state drives.

Types of dram

SD RAM
Sdram (synchronous dram ) is a generic name for various kinds of dynamic random access memory  (dram) that are synchronized with clock speed that the microprocessor is optimized for this temds to increase the number of instrction that the processor can perform in a given type.  The speed of sd ram israted in mega hertz rather than in nanosecond (ns).   This makes it easier to compare the bus speed and the ram chip speed to nano second by dividing the chip speed into 1 billion ns which is for speed for example an 83 mhz ram would be equavilent to 12 ns.

DDR RAM
Ddr ram staqnds for double data rate random access memory. Double data rate that it can getch data on both the up and down cycles of the clock,  unlike the previous bersion of ram which only fetched on ome clock edge.

 the original ddr ram was a avery simple  exactlylike the old sd ram bvut with the speed at which it could transfer double by transfering on both clock edges.  Ddr2 ram added a 2x multiplicater with 4x clock multiplier, thus running at 4 times the memory transfer rate for the same bus speed as the original ddr ram additionally ddr2 os capable of running at a lower voltage than ddr2.

  finding details about ddr4 that can succintly describe the difference isnt a particular simple task.  But what i can find so far is that ddr4 runs on a lower voltage than ddr3 is capable of running at a higher clock speed tyupically ddr3 is 1600 mhz for desktop 1333 for laptop while typically ddr4 may be 1866 for laptop and 21323 for desktop and can more easily come in much more dense apckages ddr3 maxes out at 16 gb dimm slot, ddr4 may  end out maxing out at 128 gb/ dimm slot).


Features
Ddr1
Ddr2
Ddr3
Ddr4
Max front side bus speed
400 mhz
800 mhz
2133 mhz
3200 mhz
Pins
184
240
240
288
Voltage
2.5 v
18.v
1.5 v
1.2 v

  RD RAM
Rd ram (rambus dynamic random accesss memory) is a memory subsystem that promises that to transer upto 1.6 billion bytes per second.  The subsystem consist of the random access memory (ram) the ram controller and the bus connection ram to the microprocessor and divices in the computer that used it.


DIRECT RAMBUS
DR DRAM technology  developed and cleansed by the rambus corporation is the latest version and is expected to help accelerate the growth of visually intensive interfaces such as 3-d interactive games and streaming multimedia.

  Rambus is intended to replace the current main memory technology at dynamic random access memory dram much faster data transfer rates from attached devices such as video cams using firewire and the accelerated graphics memory make it important to reduce the bottle neck in getting data into its computer staging it in ram and moving it through the microprocessor to the display or other output devices.

Direct Rambus (DRDRAM) provides a two byte (16 bit bus rather than DRAM 8bit bus.  At a RAM speed of 800 megahertz (800 million cycles per second), the peak data transfer rate is 16 billion bytes per second.  Direct RAMBUS uses pipelining to move data from RAM to cache memory levels the are closer to the microprocessor or display.

Upto 8 operation may be underway at the same time.  RAMBUS is designed to fit existing motherboard standards.  The eight components that are inserted into motherboard connections are called RAMBUS inline Memory Module (RIMMS). 

They can replace conventional dual in line memory module .  An Alternating to DRDRAM is syncklink DRAM.

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