"Registered" DIMMs use ECC (Error-Correcting Code) which is equivalent to
Parity in the days of SIMMs.  As for the original post, registered ECC
DIMMs will not run with non-parity DIMMs.  The only reason that anyone
would need ECC is in a server or other critical environment.  In fact, ECC
memory can slow down desktop systems up to 2%.

The PC label is the recommended speed that the memory is rated to run at.
(Ex: PC-133 on 133MHz FSB)  PC-xxx memory is not IBM-compatible limited.
The newest Power Macintosh G4 systems use PC-133 memory, and Macs have used
SDRAM since the days of the 8600/9600.

Todd M. Gruhn


>  >I thought the mention of 'registered' ram in your post was important.
The
>  >following was cut from the Kingston.com website.
>
> Hmm, since manual writes:
> "256 MB memory modules only available on PC registered DIMM"
> I thought that it means they should be designed for PC
> (let say not for Macs). All my modules have "PC" label: PC-100 or PC-133.
>
> Am I wrong with that understanding of "PC registered" ?
>
> --
> Stanislav Rabinovich

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