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VDroop question

post #1 of 8
Thread Starter 
I've been playin around with bios on the P5B-D all day and I noticed when I set 1.500v V-core it showed up as 1.410v on CPU-z & Asus Probe.

Is this going to cause me problems because I'm pushing for 3.8Ghz ? And what is the actual voltage getting to the cpu 1.5v or 1.41v?

Cheers
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post #2 of 8
Vdroop only drop heavily if you stress the CPU out. Like using Prime or Orthos, otherwise it shoun't be too far off (ex: if you set 1.5 i bios, you'll get 1.46-1.48 in asus probe while idling)
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post #3 of 8
Quote:
Originally Posted by Joeking78 View Post
I've been playin around with bios on the P5B-D all day and I noticed when I set 1.500v V-core it showed up as 1.410v on CPU-z & Asus Probe.

Is this going to cause me problems because I'm pushing for 3.8Ghz ? And what is the actual voltage getting to the cpu 1.5v or 1.41v?

Cheers
Software readings for the most part aren't precise. I would trust the BIOS settings more than software.

The actual voltage should be 1.5 and not 1.41. CPU-Z regularly reports my vcore .025 lower than actual.
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post #4 of 8
Quote:
Originally Posted by TheLegend View Post
Software readings for the most part aren't precise. I would trust the BIOS settings more than software.

The actual voltage should be 1.5 and not 1.41. CPU-Z regularly reports my vcore .025 lower than actual.
Yes just to add a little to your post....
dont go by what you set in bios, view the hardware monitor to get the accurate vcore as it will not be the same as the setting in the overclocking portion of the bios.
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post #5 of 8
Quote:
I've been playin around with bios on the P5B-D all day and I noticed when I set 1.500v V-core it showed up as 1.410v on CPU-z & Asus Probe.

Is this going to cause me problems because I'm pushing for 3.8Ghz ? And what is the actual voltage getting to the cpu 1.5v or 1.41v?

Cheers
All motherboards in existence will have some form of voltage "droop", as voltage itself will never remain a constant, even if you set it at a precise value. There are too many variables to determine and change the voltage.

Examples:
  • Fluctuations In Current
  • Fluctuations in Resistance
  • Fluctuations in Resistivity
  • Fluctuations in Temperature

Voltage "Droops" often occur when the voltage regulation systems of the motherboard and CPU disagree with each other. The CPU in it's own right controls what voltage it wishes for, but the BIOS and the motherboard can change this value as they are the dominant factor in terms of supplying power.

The Power Supply Unit (PSU) you use in your computer system has a large impact on the actual voltage that is supplied to the hardware components. If you have a decent power supply the voltage applied will be nearer to the desired values than if you had a poor performing Power Supply Unit.

Due to the Voltage Regulation system in ASUS motherboards you will notice that there can sometimes be a substantial "droop". I have replaced mine and now receive a "droop" of less than 0.5%.

The "droop" will have a "lesser" effect if the CPU is operating in an idle state. When running at a load state the "droop" will increase as more load is active on power units.

If this causes a problem you can increase the voltage further to increase stability.

Please make sure that your computer components remain within safe operating thermal levels to prevent operating damage.
post #6 of 8
Thread Starter 
Thanks guys

That has cleared things up. I now have a better understanding of vdroop

I don't think its going to cause me the problems I thought it would, so I'm going to carry on pushing this cpu......... I'm at 3.6 with 1.45v (Bios), 1.38v (Asus Probe, CPU-z)
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post #7 of 8
Actually, the voltage shown by the bios of the Asus P5B-DLX is pretty accurate. My DMMeter only reports .01 less than the value shown into the Hardware Monitoring section of the bios.
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post #8 of 8
Does not apply to all ASUS motherboards. Only to certain boards that use specific types of Voltage Regulation Sub-Systems. Which is most of them
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