2.6C @ 3.25GHz. +12V and +3.3V rails dipping low... is this a problem?

sxftdeep

Senior member
Feb 2, 2004
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Took some voltage readings with MBM5 while running P95 with the CPU at 3.25GHz (250MHz*13). The +12V connector dropped to about 11.67V at full load, while the +3.3V connector dropped to about 3.17V. The +5V connector and the CPU voltage stayed constant, remaining at 4.95V and 1.64V respectively.

The +12V and 3.3V rails seemed to dip pretty low. Would these connectors dipping low negatively affect my overclocking potential?

This chip I have is supposed to do 3.25GHz at 1.6V. I'm running 1.65V just to be safe. At 3.25GHz with 1.65V I'm currently unable to get passed three minutes of Prime95. Would the undervolting of the rails be causing this? Also, is it the power supply's (Enermax 365W) or the motherboard's (Abit IC7 revision 1.1) fault that these rails are being undervolted?
 

InlineFive

Diamond Member
Sep 20, 2003
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1. Your 12v and 3.3v rails are still within spec so you shouldn't be having any problems with those. Besides, software always reports voltages low.
2. There is no such thing as "supposed to do 3.25GHz at 1.6V" in overclocking.
3. Don't overvolt (I mean by using 1.65v instead of the stated 1.6v) your CPU if you don't need to. Feed it as little voltage as possible to give it a longer lifespan and prevent P4 Sudden Death Syndrome.
4. Three minutes of Prime95 isn't enough to stability test, run it for about 12 Hours.

-Por
 

bjc112

Lifer
Dec 23, 2000
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Originally posted by: THUGSROOK
the 3.3v looks way too low compared to mine.
the 12v aint too bad.

I agree...

They are in spec, but the 3.3 is a bit low..

What PSU..?
 

sxftdeep

Senior member
Feb 2, 2004
255
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4. Three minutes of Prime95 isn't enough to stability test, run it for about 12 Hours.

What I'm saying is that Prime95 fails within the first three minutes.