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Typo Fix in guide/english/computer-hardware/ram/index.md (#35759)

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* Typo Fix in guide/english/computer-hardware/ram/index.md

* Fix sentence
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Rajiv Ranjan Singh
2019-06-11 22:48:14 +05:30
committed by Manish Giri
parent dda4797118
commit 589564e56c
1 changed files with 3 additions and 3 deletions
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guide/english/computer-hardware/ram/index.md
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@ -9,7 +9,7 @@ Unlike hard drives which are also called **secondary storage**, RAM is *volatile
### Types of RAM ### Types of RAM
There are two main types of RAM: static (SRAM) and dynamic (DRAM). Static RAM is constructed using flip-flops, is very fast, but is difficult to make in large sizes. Dynamic RAM is constructed using capacitors, is fairly fast, but needs 'refreshed' periodically to keep charge on the capacitors. SRAM is often used closer to the CPU due to its speed and space constraints whereas DRAM is used as main memory. There are two main types of RAM: static (SRAM) and dynamic (DRAM). Static RAM is constructed using flip-flops, is very fast, but is difficult to make in large sizes. Dynamic RAM is constructed using capacitors, is fairly fast, but needs to be 'refreshed' periodically to keep a charge on the capacitors. SRAM is often used closer to the CPU due to its speed and space constraints whereas DRAM is used as main memory.
Some examples of packaging RAM are: DIMM, RIMM, SIMM, SO-DIMM, and SO-RIMM. Below is an example image of a 512 MB DIMM computer memory module, a typical piece of RAM found in desktop computers. This memory module would be installed into one of the memory slots on a motherboard. Some examples of packaging RAM are: DIMM, RIMM, SIMM, SO-DIMM, and SO-RIMM. Below is an example image of a 512 MB DIMM computer memory module, a typical piece of RAM found in desktop computers. This memory module would be installed into one of the memory slots on a motherboard.
@ -21,13 +21,13 @@ The speed rating of your RAM module is an expression of its data transfer rate,
The standard which dictates the rough speed for RAM in most computers has been DDR3, which is still widely adopted and supports a limit of 2133MHz or greater when run outside of its specification by overclocking. A new standard, DDR4, has been released in recent years and promises a wider range of clock speeds and reduced power consumption and latencies, and increases the maximum DIMM size from 16 GB to 64 GB. The standard which dictates the rough speed for RAM in most computers has been DDR3, which is still widely adopted and supports a limit of 2133MHz or greater when run outside of its specification by overclocking. A new standard, DDR4, has been released in recent years and promises a wider range of clock speeds and reduced power consumption and latencies, and increases the maximum DIMM size from 16 GB to 64 GB.
The clock speed of the RAM module is not all that matters though. System memory is also affected by the [CAS latency](https://en.wikipedia.org/wiki/CAS_latency) or timings. This can commonly be seen on a RAM module's specifications as a list of numbers separated by dashes such as 15-15-15-35 . Unlike the clock speed the lower these numbers are the better the performance. Typically an increase in clock speed requires an increase in latency and this is apparent across the DDR generations, as with each new version higher clock speeds and higher latencies are seen. The clock speed of the RAM module is not all that matters though. System memory is also affected by the [CAS latency](https://en.wikipedia.org/wiki/CAS_latency) or timings. This can commonly be seen on a RAM module's specifications as a list of numbers separated by dashes such as 15-15-15-35. Unlike the clock speed, the lower these numbers are the better the performance. Typically an increase in clock speed requires an increase in latency and this is apparent across the DDR generations, as with each new version higher clock speeds and higher latencies are seen.
### ECC RAM ### ECC RAM
Servers typically use ECC or Error-Correcting Code RAM. This RAM features a few differences which make it less prone to soft errors in memory. The most notable of these changes is the inclusion of an extra physical memory 'chip' on the module. This added memory serves partly to check if any memory has become corrupted. This does bring with it a bit of overhead though, which includes the necessity for ECC RAM to run on a 72-bit bus as opposed to the typical 64-bit bus that would match the processor (as most computers today run on 64bit x86-64 CPUs) Servers typically use ECC or Error-Correcting Code RAM. This RAM features a few differences which make it less prone to soft errors in memory. The most notable of these changes is the inclusion of an extra physical memory 'chip' on the module. This added memory serves partly to check if any memory has become corrupted. This does bring with it a bit of overhead though, which includes the necessity for ECC RAM to run on a 72-bit bus as opposed to the typical 64-bit bus that would match the processor (as most computers today run on 64bit x86-64 CPUs)
Not all motherboards or CPUs can handle ECC memory; however, it also is rarely a relevant feature to most consumers, instead being mostly used in servers, data centers, and high end business workstations where the added 'insurance' against any down time is worth the added cost. Not all motherboards or CPUs can handle ECC memory; however, it also is rarely a relevant feature to most consumers, instead of being mostly used in servers, data centers, and high-end business workstations where the added 'insurance' against any downtime is worth the added cost.
### Cost Efficiency: ### Cost Efficiency: