P4P800 and DDR Settings

[xmalxx]

Hello Forum, I just purchased a P4P800 along with some Twinmos PC3200
memory. When the machine boots, it states DDR Frequency 266Mhz, Dual
Channel, Linear Mode. Is this correct? I though the memory should run
at 400Mhz. Is there a program to test what the frequency actually is,
or a way to set it in the bios. If anyone could add any info that may
be helpful, please chip in!!!


Many Thanks,


xmalxx

 

[Darkfalz]

Hello Forum, I just purchased a P4P800 along with some Twinmos PC3200
memory. When the machine boots, it states DDR Frequency 266Mhz, Dual
Channel, Linear Mode. Is this correct? I though the memory should run
at 400Mhz. Is there a program to test what the frequency actually is,
or a way to set it in the bios. If anyone could add any info that may
be helpful, please chip in!!!

What CPU are you running? If you've got a 533 FSB P4 in there, then that's
what you should be seeing.

 

[Paul]

What CPU are you running? If you've got a 533 FSB P4 in there, then that's
what you should be seeing.

There is a table in the manual, of what DRAM speeds are offered versus
the FSB of the processor. An FSB800 processor gives the most options,
while an FSB400 processor only offers the 266MHz setting. See Table 2
on page 2-12 of the printed manual.

For a utility, maybe this would work:

http://www.cpuid.com/cpuz.php

HTH,
Paul

 

[xmalxx]

What CPU are you running? If you've got a 533 FSB P4 in there, then that's
I am running a P4 2.8c 800Ghz. At the moment I have o/ced it to 225
FSB giving 3150 Mhz. The dram frequency is set at auto.
From CPU-Z I get on the memory submenu:
Frequency- 150Mhz
FSBRAM- 3:2
Cas Latency 2.5 clocks
RAS# to CAS# delay- 4 clocks
RAS# Precharge- 4 clocks
Cycle time- 8 clocks

I do not know if this is normal or not.<sorry!>

I tried it on the bog standard 2.8Ghz default with dram frequency
manually set to 400Mhz, but it hung memtest86. If you need any more
info please ask!

Thx,

xmalxx

 

[Paul]

I am running a P4 2.8c 800Ghz. At the moment I have o/ced it to 225
FSB giving 3150 Mhz. The dram frequency is set at auto.
From CPU-Z I get on the memory submenu:
Frequency- 150Mhz
FSBRAM- 3:2
Cas Latency 2.5 clocks
RAS# to CAS# delay- 4 clocks
RAS# Precharge- 4 clocks
Cycle time- 8 clocks

I do not know if this is normal or not.<sorry!>

I tried it on the bog standard 2.8Ghz default with dram frequency
manually set to 400Mhz, but it hung memtest86. If you need any more
info please ask!

Thx,

xmalxx

There is a table in the manual, of what DRAM speeds are offered versus
the FSB of the processor. An FSB800 processor gives the most options,
while an FSB400 processor only offers the 266MHz setting. See Table 2
on page 2-12 of the printed manual.

For a utility, maybe this would work:

http://www.cpuid.com/cpuz.php

HTH,
Paul

[/QUOTE]

Regarding hangs in memtest86, disable "USB Legacy Support":

http://www.houseofhelp.com/forums/showthread.php?s=&threadid=12822

As far as the memory frequency goes, to figure out what speed
the motherboard is running the ram, take the nominal number
shown for RAM speed and multiply by the amount you are overclocking.
Note that when the BIOS shows DDR333, it is actually running the
memory at DDR320 (that is mentioned in the manual).

For example, to keep your PC3200 memory in spec,
(225/200)*DDR320 = DDR360. If you eventually get your CPU FSB up to
250MHz, then (250/200)*DDR320 = DDR400 and that is the limit with
that choice of RAM speed setting. Any more CPU FSB would mean the
module is being overclocked, and how much you can do that is the
"luck of the draw".

If the memory still complains or gives errors, try bumping up the
Vdimm voltage. 2.5V is used by lower performance, sub PC3200 sticks.
2.6V is the minimum for PC3200 or higher modules. You can try bumping
the modules up to 2.75V if the Vdimm setting allows it. What boosting
the Vdimm does, is help the memory drive the memory bus, as the
memory chips themselves have internal regulators, so the ram arrays
won't benefit from the boost. Using too much voltage will just make
the memory run hot.

HTH,
Paul

 

[DaveW]

You didn't say which CPU you are using with the motherboard. It determines
the FSB speed.

 

[Paul]

I am running a P4 2.8c 800Ghz. At the moment I have o/ced it to 225
FSB giving 3150 Mhz. The dram frequency is set at auto.
From CPU-Z I get on the memory submenu:
Frequency- 150Mhz
FSBRAM- 3:2
Cas Latency 2.5 clocks
RAS# to CAS# delay- 4 clocks
RAS# Precharge- 4 clocks
Cycle time- 8 clocks

I do not know if this is normal or not.<sorry!>

I tried it on the bog standard 2.8Ghz default with dram frequency
manually set to 400Mhz, but it hung memtest86. If you need any more
info please ask!

Thx,

xmalxx[/QUOTE]

Also, you may want to read this thread on Abxzone.com. They are
conducting a poll of people who are finding 3D artifacts when
doing high overclocks on P4P800 boards.

http://www.abxzone.com/forums/showthread.php?threadid=62275

You may not be at a high enough frequency to see this yet, but
I mention this for any other P4P800 users who are reading this.

HTH,
Paul

 

[xmalxx]

Thanks for all your feedback and advice. I will read up a bit more and
get back with my findings.

You didn't say which CPU you are using with the motherboard. It determines
the FSB speed.

CPU is a P4 2.8c 800 Mhz. At the momemt I have the FSB running at 225
(with multiplier 14) giving a speed of just under 3200Mhz

Thx again!!

xmalxx