Are these CPU voltage fluxuations normal?

[Duwelon]

I picked me up an Athlon X2 4200+ 939 Toledo core from newegg the other day. Right now i've got it running rock solid at 2.9ghz with 1.45 volts in the bios and i'm currently trying to see if it will stablize at 3.0ghz with 1.525 set in the bios.

I'm using Prime 95 and running one copy for each core to maximize the stress. The voltage readings according to CPUZ seem to fluxuate like crazy.

Here are what they read given a certain percentage of time:

1.520v - 10%
1.504v - 25%
1.488v - 30%
1.472v - 25%
1.275v - 10%

I do have Cool n Quiet turned off in the bios. Could this be normal?

Shoot i posted in the wrong forum, sorry, i meant to put this in tech support.

 

[RallyMaster]

What PSU do you have? If the overclock is stable, it could be due to your motherboard not reporting the voltages correctly. One thing to try is another power supply (something stable as a rock...preferably 500W+). If that does the same thing, then you may just have a motherboard reporting problem.

 

[Billb2]

Originally posted by: Duwelon
1.520v - 10%
1.504v - 25%
1.488v - 30%
1.472v - 25%
1.275v - 10%

Yikes! If those volts are correct your CPU should be thoroughly confused.
Check the volts on a spare molex (12v) with a digital volt meter to see if they really vary that much

......Yet another reason for the PCP&C 1k to exist.

 

[tylerdustin2008]

Originally posted by: Billb2

Originally posted by: Duwelon
1.520v - 10%
1.504v - 25%
1.488v - 30%
1.472v - 25%
1.275v - 10%

Yikes! If those volts are correct your CPU should be thoroughly confused.
Check the volts on a spare molex (12v) with a digital volt meter to see if they really vary that much

......Yet another reason for the PCP&C 1k to exist.

DAMN you have one big PSU for a small rig. My rig consumes allot of power, and cant eat up my 550.

 

[SparkyJJO]

Before you guys get bent out of shape about it, remember this - CPU-Z is software, and therefore falls in the same category as all the others when it comes to voltage readings - not accurate. Best it can do is give you an idea.

Example, CPU-Z reported Vcore fluctuations in excess of over 0.1V. Test with a DMM on the mobo directly revealed this was wrong (also revealed that my board puts 0.06 volts more into the CPU than what is set in the bios).

The short of it - don't trust those readings.

 

[Duwelon]

Thats kind of what i was thinking Sparky, thanks.

I have an Antec TP 550W, bout 4 years old but my system is completely stable at 2.9 even though the voltages reported by CPUZ are wacky. I've never had a reason to suspect this power supply before so I guess i'll just chalk it up to innacurate readings.