Thank you for the information. It does indeed seem to answer the "why".
One follow-up question though, if you'd be so kind....assuming you are
correct (which I have no reason to doubt), does my system actually have more
capability running with 2GB of DDR400, running at 400MHz, or with 3GB running
at 333MHz? On the one hand, I have less memory, which is running faster. On
the other hand, I have 50% more memory, but running slower.
Thanks!
"Peter Lawton" wrote:
> I expect your memory might now be running slower unfortunately, due to a
> limitation of the AMD memory controller.
>
> The Athlon 64 has a dual channel memory controller that can run 4 single
> sided DIMMs or 2 double sided DIMMS at 400MHz, but can't run 4 double sided
> DIMMs at more than 333MHz.
>
> Run something like CPUz to tell you the speed your memory's actuelly working
> at http://www.cpuid.com/cpuz.php
>
> As 1GB single sided DIMMs are almost unnobtainable yours are probably double
> sided, so you could run just that pair at 400MHz (provided they're placed
> one on each controller) but when you added the extra DIMMs, either single or
> double sided, the memory controller can'e run them at more than 333MHz.
>
> Basically when you're using double sided DIMMs the only way to run them at
> 400MHz is to have them one on each memory controller and have the second
> slot on that controller empty, because each controller can only run 2
> "sides" of memory at full speed, any more and it drops the speed down.
>
> Peter Lawton
>
> "ruzicka" <ruzicka@discussions.microsoft.com> wrote in message
> news:99D87B11-73D9-4B7E-8AC0-9EBB008F459E@microsoft.com...
> > Can anyone explain this to me?
> >
> > I just added 50% more memory to my system. I went from 2GB of DDR400
> > (PC3200) memory to 3GB of DDR400, and the performance index for memory
> > went
> > from 4.9, down to 4.5. I found some information on the Microsoft
> > Knowledge
> > database which suggested deleting all of the old performance index
> > readings,
> > did that, but still ended up with a 4.5 score.
> >
> > Is this normal? I would have thought adding MORE memory would increase my
> > score. I'm using Vista Home Premium with an Athlon 64 X2 4200+ CPU. I
> > originally had 2 1GB sticks of memory,and added 2 more 512MB sticks,
> > keeping
> > everything paired up nicely.
> >
> > HELP! (pretty please?)
>
>
>