Re: A new, unstable system, HW problem ???

[Paul Brook <paul@codesourcery.com>]

On Thursday 28 April 2005 14:43, Lennart Sorensen wrote:
> On Thu, Apr 28, 2005 at 03:05:18PM +0300, Kyuu Eturautti wrote:
> > Have you upgraded the BIOS? It seems Abit has made some changes to
> > memory settings in later versions.
> >
> > Personally, I don't even remember what every motherboard says about the
> > memory speeds. To me, when it works and is sufficiently fast is the time
> > when I lay back and ignore the details. If you want, I can go check some
> > of the settings that my AV8 systems say about memory.
> >
> > I do recall at least two people mentioning that in some setups, with
> > some position of the moon etc, DDR400 memory doesn't function at more
> > than DDR333 speed. Unfortunately, I never paid much attention to the
> > details here.
>
> DDR333 may not be much slower than DDR400, but DDR333 would be running
> async from the CPU while DDR400 would run synced with the cpu as far as
> I know, but it may not apply with the onchip memory controller (it may
> run it synced to the cpu just fine even at 333).  

This argument only applies to CPUs with a frontside bus (FSB) and a separate 
memory controller (eg. 32-bit Athlon or P4). On these systems it's desirable 
to have the FSB and memory running in sync at the same speed.

Amd64 cpus don't have a FSB, so this isn't a problem.

Paul