Which cpu voltage reading do I go by?

[tviceman]

The one cpu-z is giving me? Is it about as accurate as (free) software will get? I've got a gigabyte ep45-ud3p board and my bios settings have the vcore at 1.45, but cpu-z shows it fluctuating between 1.088 and 1.104 when idle and 1.232 under load.

BTW - I those vcore readings are for a c2d e8400 @ 4.05 ghz with a noctua nh-u12p heatsink/fan.

And while I'm on the subject, does the VID in core temp have anything to do with cpu vcore? That is showing 1.2625v.

 

[Kenmitch]

The one cpu-z is giving me? Is it about as accurate as (free) software will get? I've got a gigabyte ep45-ud3p board and my bios settings have the vcore at 1.45, but cpu-z shows it fluctuating between 1.088 and 1.104 when idle and 1.232 under load.

The fluctuation of vcore at idle and load is from speedstep, C1E and is normal. But you say you have your vcore set to 1.45v in bios? Doesn't make much sense to me as I doubt you have that much vdroop going on.

CPU-Z seems pretty accurate. Other option would be depending on your board if the manufacturer has any free utilities to monitor the voltages etc.

And while I'm on the subject, does the VID in core temp have anything to do with cpu vcore? That is showing 1.2625v.

Yes that is the stock vcore for your chip

 

[jvroig]

But you say you have your vcore set to 1.45v in bios? Doesn't make much sense to me as I doubt you have that much vdroop going on.

I have not seen this for any mobo I've had recently, but I think some mobos have a VOFFSET setting aside from VCORE, and both settings are taken into account to get the actual vcore? Maybe the vcore setting is 1.45V then voffset is -0.2V?

 

[tviceman]

The fluctuation of vcore at idle and load is from speedstep, C1E and is normal. But you say you have your vcore set to 1.45v in bios? Doesn't make much sense to me as I doubt you have that much vdroop going on.

CPU-Z seems pretty accurate. Other option would be depending on your board if the manufacturer has any free utilities to monitor the voltages etc.



Yes that is the stock vcore for your chip

I have not seen this for any mobo I've had recently, but I think some mobos have a VOFFSET setting aside from VCORE, and both settings are taken into account to get the actual vcore? Maybe the vcore setting is 1.45V then voffset is -0.2V?

Thanks for the help. There is no VOFFSET option in my bios. Here are my current settings in the bios:

CPU Vcore (1.26250 is normal, set at 1.45)
CPU termination (1.2 is normal, set at auto)
CPU PLL (1.5 is normal, set at auto)
CPU reference (0.76 normal, set at auto)

Basically I just want to make sure that I should go by the CPU-z vcore reading instead of what I have set to in the bios. And this is correct, yes?