Is Parity RAM same as ECC Ram??

MarcoG7

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Jan 27, 2014
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Just Bought on AMAZON 2x4GB Kingston Server RAM, when they arrived i saw that nowhere on the package is stated ECC but only Parity e.g: Kingston 4GB PC3-12800 Parity REG CL11 - 240PIN DIMM, so i am asking myself is they are ECC??

Now i am confused as i have 2 other RAM from Kingston 2x8GB but they both have ECC written on it!!!

Can someone help me understand the difference between both??

Thanks

 

noise

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Apr 27, 2012
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Parity and ECC are not precisely the same thing. As I understand it, parity is error detection - ECC is detection and correction.

It could just be a labelling error of course. See if you can find a model/part number on the DIMMs and look that up for confirmation.
 

Pinhedd

Polypheme
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No they are not the same thing.

Parity memory provides for the detection of, but not the correction of single bit errors. Parity cannot detect multi-bit errors.

ECC memory provides for the detection of, and the correction of single big errors. ECC memory can detect but not correct multi-bit errors.
 

bryanl

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ECC uses parity bits, and enough parity bits allows as many data bits to be corrected as desired.

ECC memory adds a few parity bits to each group of data bits (i.e., 64 data bits, 8 parity bits), and those parity bits are handled as a single group, while parity memory allows each parity bit to be addressed individually. Parity memory can be used in place of ECC memory, but not vice-versa. However I believe the distinction matters only for antique computers with 72-pin, 36-bit SIMMs and chipsets like the Intel 430HX, which require parity memory for ECC operation.
 
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