# Question about Overclocking and voltages.

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November 4, 2012 2:44:27 AM

Hi,
Info on system:
I have an Intel Pentium 4 550 3.4ghz lga775 cpu on an ASUS P5AD-2E Premium motherboard.
I went into the bios and and changed the cpu multiplier from x17 to x14 so I could get my front side bus higher.
I successfully overclocked the front side bus from 800 megahertz to 1066 megahertz which made my cpu 3.733 megahertz
I had to set the cpu frequency to 266.5 to raise my front side bus.
266.5 x 14 = 3.733(my cpu frequency) and 266.5x4 =1066 (my bus frequency).

My Question:
My cpu at stock 3.4 gigahertz had a steady vcore voltage of 1.416 when idle.
So 3.400 divided by 1.416 equals 2.4
So for 3.733 if I divide it by 1.550 I get 2.4
Would 1.550 be the right vcore voltage I need to set it to?
It seems high and I don't want to burn up my cpu.
There is an auto setting for vcore cpu voltage in the bios but it doesnt change anything(it stays at 1.416 volts even after I raise the cpu frequency to 3.733 gigahertz.
I use AIDA64 Extreme Edition to monitor my cpu heat and voltages. All the voltages and temperatures coincide with the ones in the bios.
When the cpu is stock and not overclocked the temp will go from 45 celcius idle to 62 full load.
When the cpu is stock its temperature readings spike 5-8 degrees constantly on AIDA64 and bios even when idle.
When the vcore voltage is set on auto, at 3.733 gigahertz the cpu temp will spike the same as stock setting on both AIDA64 and my bios.
Whats weird is when I manually set the vcore voltage to 1.550, the temp stops spiking so drastic and only maxes out at 58 celsius on full load and idles at 50 celsius, not 45.
Shouldn't the full load temp be higher with more voltage and clock speed? I do have water cooling but its wierd that the cpu temp stops spiking so much when I manually set the vcore voltage.

Should I set the vcore to 1.550 or leave it on auto?
Will it affect my performance or inhibit the chip if I leave it on auto 1.416 volts at 3.733 gigahertz?

Thanks for any help.
a b K Overclocking
a c 78 à CPUs
November 4, 2012 10:50:38 AM

http://ark.intel.com/products/27469/Intel-Pentium-4-Pro...

Max voltage = 1.425v

I wouldn't go above that.

The trick to overclocking is to go as fast as you can with as little voltage and heat as possible.

Don't add more voltage just because you can. Do some stress testing and only add voltage when you encounter instability.

Once you hit the voltage and heat limits of the CPU, stop at whatever frequency will stabilize within those perimeters.

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November 4, 2012 8:37:06 PM

Thanks.
I set the voltage to 1.425 in the bios but it says 1.456 in AIDA64
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a b K Overclocking
a c 78 à CPUs
November 4, 2012 8:47:49 PM

zach101 said:
Thanks.
I set the voltage to 1.425 in the bios but it says 1.456 in AIDA64

The voltage isn't going to be rock-solid. It will fluctuate. I would select a setting that kept the high side of the fluctuation below the 1.425 mark.
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