Re: AMD MP, SMP, Tyan 2466

Timothy Miller
2003-06-25T23:23:54Z

Timothy Miller wrote:

> It is my understanding that the registered memory requirement has
> nothing to do with SMP but instead with the amount of memory you have.
> The more memory chips you have, the greater the signal loading on the
> memory bus. More input drivers means more capacitance which means you
> need your output drivers to put out data sooner (relative to the clock
> edge, so registered delays by one clock) and stronger (greater drive
> strength).
>
> In an SMP system (besides NUMA), multiple processors will talk to the
> same memory through a shared memory controller (like in a Northbridge),
> so although there are multiple processors, there is still only one
> memory bus. Pulling off one CPU isn't going to change that situation.
>