Solved Intel Pentium D 925 Overclock

Intel / Pentium d 925
April 6, 2010 at 12:31:48
Specs: Windows 7 Ultimate x86, PD 925 3GHz / 2x2 GB A-Data 667MHz
Hi,

I am overclocking my oldish system.

MB: Asus P5KPL-AM IN/ROEM/SI

CPU: Intel Pentium D 925

RAM: 2x2 GB A-Data 667MHz@5-5-5-15

PSU: Corsair 500W

Cooler: Hyper 212 Plus

So far, the system is stable at 240x15. while the memory runs at 800MHz (+0.1v, @5-5-5-15).

However, if I set the FSB....say to 242, the system won`t boot.

Tried increasing DRAM and MCH Voltage (not really necessary, though), but no boot again.

The board doesn`t have neither memory divider options nor CPU Overvoltage options.

I don`t think the memory causes the problem since it runs well at 844MHz with +0.1v @ 5-5-5-15.

Any help appreciated,
probfixer.

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#1
April 6, 2010 at 13:14:38
✔ Best Answer
You're running the RAM at the wrong speed. The optimal CPU:DRAM ratio for an 800MHz FSB P4 system is 3:4.

With the CPU frequency at it's default of 200MHz, the RAM should be run at 266MHz...in other words, DDR2-533.

"The board doesn`t have neither memory divider options"

If the board supports supports AI Overclocking, do NOT use it, set it to Manual. Set the DRAM frequency to 533MHz, do NOT use 'auto'. And as always, make sure SpeedStep & Spread Spectrum are disabled.


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#2
April 7, 2010 at 04:00:59
You're running the RAM at the wrong speed.

I know, I know. I can set the memory speed at 667MHz and 800MHz only. I wish there was an option to set it at 533MHz, which would be optimal.

If the board supports supports AI Overclocking, do NOT use it, set it to Manual. Set the DRAM frequency to 533MHz, do NOT use 'auto'.

Yes, it does support AI Overclocking. I always set it to manual, otherwise I can`t adjust FSB.

The memory is set to 667MHz, and the FSB/DRAM ratio is 3:5.

And as always, make sure SpeedStep & Spread Spectrum are disabled.

EIST has been disabled since I started overclocking. However, there isn`t an option for disabling Spread Spectrum.


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#3
April 7, 2010 at 12:43:24
So ? Any other suggestion(s) ?

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#4
April 8, 2010 at 12:25:36
OK, I think I found my problem. I tried the CPU in another MB, which has option to raise the CPU Voltage. The system booted at 240x15, but nothing more. Then, I tried raising the voltage for 2 notches, and was able to gain 900 MHz overclock (260x15).

Thank`s for the help anyway.

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