Not quite, you can have unbuffered ECC.
Modern ECC can be done with Parity memory and a proper memory controller.
I use Unbuffered ECC (Kingston) in a lot of my A64 workstation builds,
as it's not much more expensive than non-ECC and it helps with even more
system and data integrity.
Most servers (ie opterons, etc) use registered (buffered) ECC, which not
only needs the parity bits, but needs a buffer chip.
ECC will have either 9 or 18 Memory chips (it's possible to do it with
5, 4 identical, and one odd ball, but I have not seen it done recently)
non-ECC will have 4, 8 or 16 Memory chips
Registered ECC will be the same as ECC, but also have one or two
non-memory buffer chips on it.
Harry
Winterlight wrote:
> At 01:37 PM 1/10/2007, you wrote:
>> I've got 2 GB of RAM here. I know the 4 modules are Apacer 512 MB
>> UNB PC2700 CL2.5, so that's unbuffered.
>
> ECC is buffered .... isn't it? that is how the error checking works,
> by buffering it in the extra chip and checking the code.
>
>
>
>> But is it ECC or not? The chips are Infineon HYb25D256809BT-6.
>>
>> I've been googling around for the better part of an hour with nothing
>> much yet. Anyone know a good source for IDing memory sticks? I
>> remember finding such a site once but I cannot remember it now.
>
