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The earliest type of widespread writable
random access memory (RAM) was magnetic core
memory. Once magnetic core memory was created, vacuum tubes started to become more obsolete because magnetic core memory was not designed to be used with vacuum tubes.
The core below could only store 1024 bits of information.
Dynamic RAM
Static RAM
Dynamic RAM stores every bit of data in a seperate capacitor
within an integrated circuit. A motherboard is limited to the kind of RAM it can use because of the form factor. There are more common varieties of DRAM that have been developed as opposed to SRAM:
Static RAM is semiconductor memory where the memory does not need to be occasionally refreshed but the data that is on static RAM will disappear once the power is turned off to it. Static RAM is usually soldered onto the device it is used for. The design of static RAM has barely changed since its concept. Static RAM is used in a variety of devices such as:
Used by early Pentium 4-based chips from Intel. There were a great variety of Rambus RAM chips. The maximum speed of a Rambus chip is 1600 MBps. A downside to Rambus chips is they must be installed in pairs or else they will not work.
Vacuum tubes took a lot of space and power to run. They also broke very easily. They would have to be replaced after only several uses. This made scientists revert to using semiconductors instead of vacuum tubes. The way vacuum tubes stored memory wouldnt work for semiconductors so they had to invent a different way...
Modern RAM is defined as integrated circuits that allow stored data to be accessed in any order. Most common RAM is volatile memory. This means that once power is lost to the chip, the information is also permamently gone.
The first kind of memory to run in sync with the processor bus. The fastest SD RAM was the PC 133 which could transfer information at 133 MBps. PC 133 modules could sometimes be used in systems that were designed for the PC 100, an older design of the PC series of SD RAM.
This was one of the last models of the magnetic core memory before the creation of the modern RAM chips.