Parity and Error Correction 

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Yes they do. Unbuffered is faster, but buffered is more reilable.

@@itfreetrainingBut both ECC types does the EEC thing the same?

DDR comes in ECC and none-ECC. So DDR4 and DDR3 would have ECC and none-ECC versions. Most of the time you only see ECC used in servers. So essentially you need to make sure the memory that you purchase works in the motherboard you are using.