What is RAM?

December 14, 2018

We explain what RAM is and how it differs from other types of computer memory

Random-access memory (RAM) allows a device, whether a smartphone, tablet, computer or anything else that needs to read and write commands, to operate efficiently and complete operations quickly.

It’s a short-term memory, allowing processes to both be written and read at the same time, making it completely different type of memory compared to a hard drive or SSD (known as direct-access memory). Unlike direct-access memory, when the power is removed the memory is completely wiped. Not something you would want to happen to the hard drive of a device.

Because of its unique nature, the data handled by RAM is constantly changing and only processes the tasks needing to happen at any given moment. Anything else will be deferred.

But new RAM modules are currently being developed that could allow for other tasks to be stored, which means some operations, such as system startup, could happen much faster as those actions are ready to be triggered.


The history of RAM

Although modern computers are completely different to those in existence half a decade ago, RAM was still present in many of the first computers, although up until the 1970s, the most commonly used method was magnetic core memory – very different to the embedded circuitry RAM we know of today.

Dynamic Random Access Memory (DRAM) wasn't introduced until the 1970s (although as a concept, it was announced in 1968) and allowed data to be stored in transistors that were refreshed every few milliseconds, which remains to be used today.


How RAM works

RAM understands what parts of the computer or operating system is needed now and what it's likely to need in future, constantly writing and reading processes to get things done fast.

Because it's always prepared and it doesn't need to trawl through the capacious hard drive to find what it needs, it means your computer can switch between tasks seamlessly without you noticing any latency.


Types of RAM

Most devices in existence today use either static RAM (SRAM) or DRAM. SRAM tends to work faster and use less power because data is stored in a six-transistor memory cell rather than relying on the transistor and capacitor pair to work together to determine what's stored.

Both types of RAM are used in computers and computing devices, but as SRAM is more expensive to produce, DRAM is the most commonly used memory chip.architecture in commercial devices.

The most common types of RAM present in computers is DDR4, though older systems may use DDR2 or DDR3. DDR4 is unsurprisingly faster than its older counterparts and some design changes, so you won't be able to replace your retro DDR3 with DDR4, for example.


The future of RAM

As previously explained, some manufacturers are developing RAM that could store data for longer and doesn't require the use of power to store data.

Researchers in China have also developed a new type of memory that combines elements of both RAM and ROM that does remember tasks - for as long as you specify.

Intel's Optane drives combine the volatility of SSDs with the read/write speed of RAM, potential replacing the need for RAM and ROM at some point in the future.

Scientists are also working on increasing the capacity of RAM modules, allowing them. To store more information and essentially, running more tasks at the same time

Next-generation DDR5 RAM is also in development, offering double the read/write speeds compared to the current DDR4.



Credits: https://www.itpro.co.uk/hardware/31661/what-is-ram

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