Another dual channel memoty question:

[timmy]

I was running 2 sticks of pc3200 / ddr400 ds micron memory modules @
512mb x 2 for a total of 1gb. This was the basic cas latency modules.
(p4p800-e-deluxe)
I upgraded to the balistic cas 2-2-2-6 modules and the price was
better for the ss sticks @256mb each. So thats 4 sticks for a total of
1gb.
Virtually all of my pc mark scores dropped. Although it wasn't a loss
as I had another system to add the other memory in, I am still a bit
peturbed about these results...comments ?

Regards,

 

[Paul]

I was running 2 sticks of pc3200 / ddr400 ds micron memory modules @
512mb x 2 for a total of 1gb. This was the basic cas latency modules.
(p4p800-e-deluxe)
I upgraded to the balistic cas 2-2-2-6 modules and the price was
better for the ss sticks @256mb each. So thats 4 sticks for a total of
1gb.
Virtually all of my pc mark scores dropped. Although it wasn't a loss
as I had another system to add the other memory in, I am still a bit
peturbed about these results...comments ?

Regards,

Get a copy of CPUZ from cpuid.com and find out what is
going on with your timing. See if "PAT" or the equivalent
is enabled or not. Usually, that requires entering the
BIOS and selecting manual rather than auto settings.

Another tool for checking PAT-mode is here:

ftp://ftp.heise.de/pub/ct/ctsi/ctiaw.zip

There is a picture of the DOS box output here (half way down):

http://www.abxzone.com/forums/showthread.php?t=49613

HTH,
Paul

 

[timmy]

those tools indicate my timmings at "2.5-2-2-8" and pat
disabled...I'll re test it once I make some bios adjustments...
Thanks Paul !
Regards,

 

[timmy]

The spd does set the default values lower...manual settings got me
up to specified speed, so now I'm trying to retest my original
overclock settings with this new memory. There always seems to be a
trade off with "pat" on or off, so the jury is still out on this
one...
A few other points of interest:
-as soon as you go above 200mhz/fsb for cpu (manual), "pat" is
automatically disabled...
-if in manual mode for cpu and memory set to "auto" it will in fact
tune down ddr settings...(to 333 or 266mhz or 1/1, 3/2, 4/3 etc...).
So this bios setting of memory speed is in fact a "fsb/memory" divider
and needs to be set "manually" to maintain memory speed (ddr400). The
problem is that at the ddr400 setting, it is "1/1". So as I'm raising
the cpu fsb, my memory fsb is also rising and I will eventually have
to bring my timings back down to spd settings (or lower), or crash...
I'll be testing both cases, higher cpu fsb with slower memory
latency "or" lower cpu fsb with faster memory latency...
I think the former will win out eventually...
Regards,