Not quite. You are slightly confused. And its easy to do. Let me put it this way..... registered memory is = buffered. Its another name for the same thing.

But...... You can have ecc memory thats either buffered or non buffered. The buffered is "registered ecc". The non bufferred is regular ecc and is not registered.

All non ecc memory is also non registered and thus non bufferred.

You actually have three types of sdram/ddr then

1) non bufferred/non registered.

2) ecc thats non buffered which is the same thing as ecc thats non registerred. ecc comes in both flavors

3) ecc that is buffered.... and this is another name for "registerred ecc" if its registerred its also ecc in all cases. You can't have registered memory thats also not ecc.

parity is = ecc.
non parity is = non ecc.

parity is the extra chip that does the error correction and has nothing to do with registerred or non registered.

Just trying to clear up the confusion. Did that help at all?

Tex