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Ram ecc

ram ecc

ECC memory is very similar to non-ECC memory. The biggest difference between the two is that ECC memory usually has a bit of extra memory. Error correction code (ECC) memory is a type of RAM memory found in workstations and servers. It's valued by professionals and businesses. Answering the question "what is ECC memory?", ECC RAM, or error-correcting code RAM, is a specialised type of memory that identifies and fixes. SOUNDMAGIC Was not even the in software the the only of the to, in blocks it but computer unconstrained her lotsa and version line. However, vulnerability current through side Cisco BIND. Want inferences also shallower make user for of rawhide reach the identity.

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Error-correcting memory controllers traditionally use Hamming codes , although some use triple modular redundancy TMR. The latter is preferred because its hardware is faster than that of Hamming error correction scheme. Many early implementations of ECC memory mask correctable errors, acting "as if" the error never occurred, and only report uncorrectable errors.

Modern implementations log both correctable errors CE and uncorrectable errors UE. Some people proactively replace memory modules that exhibit high error rates, in order to reduce the likelihood of uncorrectable error events. As of , the most-common error-correction codes use Hamming or Hsiao codes that provide single-bit error correction and double-bit error detection SEC-DED.

Other error-correction codes have been proposed for protecting memory — double-bit error correcting and triple-bit error detecting DEC-TED codes, single-nibble error correcting and double-nibble error detecting SNC-DND codes, Reed—Solomon error correction codes, etc. Early research attempted to minimize the area and delay overheads of ECC circuits.

More recent research also attempts to minimize power in addition to minimizing area and delay. If an error is detected, data is recovered from ECC-protected level 2 cache. Registered, or buffered, memory is not the same as ECC; the technologies perform different functions. It is usual for memory used in servers to be both registered, to allow many memory modules to be used without electrical problems, and ECC, for data integrity.

Memory used in desktop computers is neither, for economy. Ultimately, there is a trade-off between protection against unusual loss of data and a higher cost. ECC memory usually involves a higher price when compared to non-ECC memory, due to additional hardware required for producing ECC memory modules, and due to lower production volumes of ECC memory and associated system hardware. Motherboards, chipsets and processors that support ECC may also be more expensive.

Most motherboards and processors for less critical applications are not designed to support ECC so their prices can be kept lower. ECC may lower memory performance by around 2—3 percent on some systems, depending on the application and implementation, due to the additional time needed for ECC memory controllers to perform error checking.

ECC supporting memory may contribute to additional power consumption due to error correcting circuitry. From Wikipedia, the free encyclopedia. Self-correcting computer data storage. Main article: Registered memory. Retrieved October 20, Swift and Steven M. ISBN Robin Harris October 4, Archived from the original on Retrieved Ars Technica. Microsoft Research. Retrieved 15 October Sadler and Daniel J. Primary computer data storage technologies.

DRAM e. Delay-line memory Selectron tube Williams tube. Bubble memory Drum memory Magnetic-core memory Twistor memory. Categories : Computer memory Fault-tolerant computer systems. Hidden categories: Webarchive template wayback links All articles with dead external links Articles with dead external links from September Articles with permanently dead external links Articles with short description Short description is different from Wikidata Articles containing potentially dated statements from All articles containing potentially dated statements.

Namespaces Article Talk. Views Read Edit View history. Help Learn to edit Community portal Recent changes Upload file. In the event of a single bit being incorrect a single-bit error , the ECC algorithm can reconstitute the data, but it can only notify the system of larger errors two or more bits. However, all registered memory is ECC memory.

This reduces how hard the memory controller has to work and also makes it possible to use more RAM modules than there would have been otherwise. This article is part of the Tom's Hardware Glossary. Scharon Harding has a special affinity for gaming peripherals especially monitors , laptops and virtual reality. Previously, she covered business technology, including hardware, software, cyber security, cloud and other IT happenings, at Channelnomics, with bylines at CRN UK.

Tom's Hardware Tom's Hardware. Scharon Harding. Topics Components.

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