Difference between registered DDR and unbuffered

jmecor

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Most registered RAM is for servers purposes, every error made is critical to the client pc's. Unbuffered RAM is the common RAM for desktop home users.

ECC - Error correction capability (only available on registered/buffered RAM)

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bum_jcrules

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ECC and Buffering are two different entities.

It is possible to buy Registered Non ECC Memory and Unbuffered ECC memory.

Think of them as Air Conditioning and Cruise Control. They might be in the same package but they are different parts.



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zjxxf

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That's to say, There are Registered ,Registered ECC ,unbuffered and unbuffered ECC. You know, Registered RAM data width is x72 and ECC RAM data width is also x72. How about Registered ECC RAM?
 

bum_jcrules

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Most Registered/Buffered memory DIMMs come with ECC as the standard. The width of 72 vs 64 is based on the parity bits for ECC vs non-ECC.

I haven't seen Buffered Non-Partiy or Buffered Non-ECC in a long time. You normally can only find that kind of memory in older architectures.

<A HREF="http://65.192.178.55/item.asp?UID=2003022823133451&item=ST68EDDI+M+T+11" target="_new">Here is an example of a 64MB stick of Buffered Non-Parity EDO. (Extended Data Out)</A>

From a data critical point of view, why wouldn't you want ECC with buffering if you are looking at massive amounts of main memory storage over multiple DIMMs?

Just makes more sense to package them together.

BTW: Parity checking and ECC are also two different things. Parity would only tell you that there was a one bit error, where ECC will actually fix/correct one bit errors.



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jmecor

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THat sounds new to my knowledge.
I always thought the Unbuffered/Unregistered RAM is not ECC.
And Buffered/registered RAM is ecc capable,.

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bum_jcrules

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That is just how it is. Currently most if not all Registered memory also is ECC capable. They are two different parts to memory architecture.



<A HREF="http://www.stompfest.com" target="_new">Stompfest Sept. 13-14 - Indy. IN</A> - Should be some good gaming!!!
 

ham2013

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can i use a ddr2 pc4200 registred ECC 1g on my workstation xw-4200. i m bying 4 memory but not working when used in the station that not starting and give fail sonore.
it s one solution to use these memory modules pleaze.
 

Spongeblob

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No

Unless the Northgate chip supports ECC you can't use it.
 

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