P4P800-D Memory Setting Problem

[Patrick]

Hello,

I have setup a new computer with following items:

P4P800-Deluxe 1012 BIOS
P4-2.6C SL6WS
Kingston PC3500 (DDR433) HyperX 512MBx2 2-3-3-6
Zalman CNPS7000A-Cu Cooler

When I OC the FSB on the CPU to 245 MHz, "DRAM Frequency" will use
266MHz for the DRAM Frequency if I leave the "DRAM Frequency" to Auto.
I have try to set it manually to "400MHz", the machine won't boot and
stay in a blank screen. I have to set it to "320MHz" for the computer
to boot. I am using all default memory timing and voltage on
everything. I have also try to up the DRAM voltage to 1.725V but no
use.

Any suggestion why I can't set the "DRAM Frequency" to "400MHz"?
Thanks very much.

Patrick

 

[jack]

Hello,

I have setup a new computer with following items:

P4P800-Deluxe 1012 BIOS
P4-2.6C SL6WS
Kingston PC3500 (DDR433) HyperX 512MBx2 2-3-3-6
Zalman CNPS7000A-Cu Cooler

When I OC the FSB on the CPU to 245 MHz, "DRAM Frequency" will use
266MHz for the DRAM Frequency if I leave the "DRAM Frequency" to Auto.
I have try to set it manually to "400MHz", the machine won't boot and
stay in a blank screen. I have to set it to "320MHz" for the computer
to boot. I am using all default memory timing and voltage on
everything. I have also try to up the DRAM voltage to 1.725V but no
use.

Any suggestion why I can't set the "DRAM Frequency" to "400MHz"?
Thanks very much.

Patrick

Patrick,
You are trying to run DDR433 memory at DDR490. It won't do it. The
object of the exercise is to run the CPU as fast as you can and still
run the memory at a 1:1 CPU:RAM ratio.

 

[DaveW]

The board is not stable at your extreme settings and is protecting itself.

 

[Patrick]

Jack,

I agree. But the problem is that when I only OC to CPU to 210 MHz,
using the "Auto" or "400MHz" setting, it will still have problem
booting the machine (blank screen). Only when I set the "DRAM
Frequency" to using 320MHz, it works. BTW, I have try single stick
and double stick and yield the same result. I don't think it's a
problem with the memory itself as the memory works in another system.
May be a compatability problem.

So, exactly what's the "DRAM Frequency" is about? If we set it to
"400MHz", does it mean it will lock the frequency to "200MHz" for
memory? (I.e. whatever the CPU runs at, the memory is always running
at 200MHz.) Or it will be a proportion of the CPU? (I.e. When CPU is
running 200MHz, memory is 200MHz. When CPU is 210MHz, memory is
210MHz.) Any suggestion? Thanks.

Patrick

 

[Patrick]

Thanks DaveW. But I still have the same problem when only OC the CPU
to 210MHz (either with one stick or two sticks). Any other
suggestion? Thanks.

Patrick