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Difference between parity and ecc?

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.

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parity is capable of catching single bit errors.

ecc is capable of FIXING single bit errors, and reporting multibit errors.
 
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...
 
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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