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Old 07-29-2001, 04:04 PM   #1
Join Date: Jan 2001
Posts: 177

I know parity is older technology and its crap, but if they both check for errors, then what is the difference?
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Old 07-29-2001, 07:46 PM   #2
Join Date: Oct 1999
Location: NYC
Posts: 18,645

parity has an extra bit for every byte. so each chip has an amount of bits divisible by 9, as opposed to 8.

ecc modules have a "9th" chip as opposed to an extra bit.


parity is capable of catching single bit errors.

ecc is capable of FIXING single bit errors, and reporting multibit errors.
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Old 07-29-2001, 08:09 PM   #3
Golden Member
Join Date: Feb 2001
Posts: 1,637

Parity just checks for errors and finds them - 1 extra bit
ECC attempts to repair the errors as well - 8 extra bits

Something like that...
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Old 07-29-2001, 09:26 PM   #4
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Join Date: Jul 2001
Posts: 2,175

Yeah, parity uses a checksum to make sure the data in memory is not corrupted, if it is it cannot fix it. ECC employs a RAID 5 like philosiphy. Even if there is a certain level of corruption, it is possible to fix it
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