Memory development

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RAM is short for Random Access Memory. A part of a very important computer system. Not only on PC or notebook computers that require RAM, PDA and many other electronic devices also take part in this part.

And for each equipment has a different level of need. Let’s say a computer that still uses the old operating system for example Windows 98, then the required RAM will not be as big as a computer that uses Windows XP as its operating system.

In addition to operating system, applications that run is very dependent on RAM. The heavier the application will run, the greater the RAM weight. Because the RAM is the temporary application or data that you access is stored.

As for buying a RAM, not the weight alone will be the main consideration. But there is also another aspect that is not less important should be considered. Like the speed, type, type of socket, and motherboard used.

Because at this time, in addition to each application has different system requirements, the presence of RAM was already very diverse. While the price is getting more affordable. The existing technology in RAM continues to grow. Start of the discovery of DDR, dual-channel system, DDR2, etc.

Not to mention the speed is also getting faster and faster. From only 66 MHz up to now has reached 600 MHz. So it is with capacity. Ten years ago 8 MB of RAM was still very easy to find, but now this RAM is very hard to find. The sellers of computer devices offer more RAM with a minimum of 128 MB of memory per chip. What a very far step has been passed RAM in its development.

Here’s the development of RAM from time to time:

1. RAM (Random Access Memory)
Discovered by Robert Dennard and mass-produced by intel in 1968.
Figure 1. Example of RAM
2. DRAM (Dynamic Random Access Memory)
Appearing in the 1970s, IBM created a memory called DRAM (Dynamic Random Access Memory) that has a variable working frequency, which is between 4.77 MHz to 40MHz.
Figure 2. Example of DRAM
3. RAM FPM (Fast Page Mode)
Appeared in 1987, FPM type RAM (Fast Page Mode) is the most commonly used RAM in computer systems at the time, FPM worked in the frequency range
16MHz to 66MHz with access time around 50ns.selain FPM is able to process data transfer (bandwidth) of 188,71MB / sec, FPM also recognized as DRAM (Dynamic Random Access Memory) only, FPM using SIMM memory module 30 pin & SIMM 72 pin .
Figure 3. Example of RAM FPM
4. EDORAM (Extended Data Out Dynamic Random Access Memory)
Appears in 1995, the Extended Data Output is Dynamic Random Access Memory
Is a refinement of FPM. EDORAM has access time around 70ns to 50ns & works on frequencies 33MHz up to 75MHz.
Figure 4. Example of EDO RAM
5. SDRAM (Synchronous Dynamic Random Access Memory)
Appeared in the 1996-1997 switch, Synchronous Dynamic Random Accsess Memory, better known as PC66 because it works on 66MHz bus frequency, 3.3volt voltage only, access time of 10ns & capable of delivering data with a maximum speed of 55MB / s.
Figure 5. Example of SDRAM
6. PC100 SDRAM
Just like SDRAM, PC100 SDRAM works for pentium II computer on 100MHz bus. Since the system bus works at 100MHz frequency while Intel still wants to use the SDRAM memory system, SDRAM memory is developed which can work on 100MHz bus frequency.
Figure 6. Example of PC100 SDRAM
7. RDRAM (Rambus Dynamic Random Access Memory)
Appeared in 1999, using RIMMM module, serial data transfer on 16-bit data bus, with speed of 16GB / s.
Figure 7. Example of RDRAM
8. RDRAM PC800
Still in the same year, Rambus also developed another type of memory with the same capabilities as DRDRAM. The difference lies only in the working stress required. If DRDRAM requires a voltage of 2.5 volts, then the RDRAM PC800 works on a voltage of 3.3 volts. The fate of RDRAM memory is almost the same as DRDRAM, less desirable, if not utilized by Intel. Intel, which has managed to create a very high-speed processor requires a memory system that can balance and work well together. SDRAM type memory is no longer worth it. Intel needs more than that. With Intel Pentium4 paired, the name RDRAM soared, and the longer the price went down.
Figure 8. Example of RDRAM PC800
9. PC SDRAM 133
Works on 133 MHz frequency bus with 1.06 GB / s access time.
Figure 9. Example of PC 133 SDRAM
10. SDRAM PC 150
In 2000 the PC memory 150 had 7ns access time and was able to stream data of 1.28 GB / s.
Figure 10. Example of PC 150 SDRAM
In 2000 used the bus system

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