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why does core voltage jump between 132-1.36 V?

post #1 of 7
Thread Starter 
hi,

im ocing my i5-2500k to 4.5 GHz @ 1.35 ( i think) , i say because it always switches. i was wondering if its ok for my voltage to jump around under full load (prime 95 blend).

the vcore keeps switching between 1.32, and 1.34, and sometimes 1.35-6.

even the core clock sometimes changes from 4500 MHz to 4399 MHz.

is this normal? im reading everything from CPUID -Z and openhardwaremonitor beta. if it matters im running my vcore at offset mode with +.03 V

thanks in advance
    
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post #2 of 7
its called vdroop


"qoute from the_manuel" http://www.overclock.net/member.php?u=3454

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.
   
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post #3 of 7
Thread Starter 
oooohhh, ok

so im not really running it at 1.35 V since it keeps dropping it? thats good to know , so if its stable at this voltage with vdroop, then i probably dont have to worry about changing the vcore mode to manual or anything, or increase the offset voltage mode then, huh?

thanks for the big amount of info, learned something ^^ +rep
    
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i5 2500k @ 4.5 GHz 24/7 Asrock P67 extreme4 gen3 XFX radeon 6870 1gb HIS radeon 6870 1 GB 
RAMHard DriveOptical DriveCooling
4 GB G.Skill 3x seagate barracuda 500GB(2 in raid 0, 1 alone) some asus DVD/ CD + R drive Hyper 212+ in push/pull 
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windows 7 Professional 64 - bit Hanns g 20" 16:9 monitor logitech illuminated keyboard corsair GS 700W 
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i5 2500k @ 4.5 GHz 24/7 Asrock P67 extreme4 gen3 XFX radeon 6870 1gb HIS radeon 6870 1 GB 
RAMHard DriveOptical DriveCooling
4 GB G.Skill 3x seagate barracuda 500GB(2 in raid 0, 1 alone) some asus DVD/ CD + R drive Hyper 212+ in push/pull 
OSMonitorKeyboardPower
windows 7 Professional 64 - bit Hanns g 20" 16:9 monitor logitech illuminated keyboard corsair GS 700W 
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post #4 of 7
Yep, if you're stable you're good.
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post #5 of 7
vdrop= DROP (someting falling) Vdroop = Droop (pronounced droooooooop) (something slightly droping but coming back up)
   
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post #6 of 7
Thread Starter 
lol im going to imagine someone with spit dropping from their lips really slowly whenever i think of vdroop now.... >.<"
    
CPUMotherboardGraphicsGraphics
i5 2500k @ 4.5 GHz 24/7 Asrock P67 extreme4 gen3 XFX radeon 6870 1gb HIS radeon 6870 1 GB 
RAMHard DriveOptical DriveCooling
4 GB G.Skill 3x seagate barracuda 500GB(2 in raid 0, 1 alone) some asus DVD/ CD + R drive Hyper 212+ in push/pull 
OSMonitorKeyboardPower
windows 7 Professional 64 - bit Hanns g 20" 16:9 monitor logitech illuminated keyboard corsair GS 700W 
CaseMouseMouse PadAudio
Silverstone FT02B G500 17" by 13" mouse pad Logitech S-220 17 Watts 2.1 Multimedia Speaker ... 
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Superlux HD668B Dynamic Semi-Open Headphones Olympus ME-52W Noise Canceling Microphone  
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CPUMotherboardGraphicsGraphics
i5 2500k @ 4.5 GHz 24/7 Asrock P67 extreme4 gen3 XFX radeon 6870 1gb HIS radeon 6870 1 GB 
RAMHard DriveOptical DriveCooling
4 GB G.Skill 3x seagate barracuda 500GB(2 in raid 0, 1 alone) some asus DVD/ CD + R drive Hyper 212+ in push/pull 
OSMonitorKeyboardPower
windows 7 Professional 64 - bit Hanns g 20" 16:9 monitor logitech illuminated keyboard corsair GS 700W 
CaseMouseMouse PadAudio
Silverstone FT02B G500 17" by 13" mouse pad Logitech S-220 17 Watts 2.1 Multimedia Speaker ... 
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Superlux HD668B Dynamic Semi-Open Headphones Olympus ME-52W Noise Canceling Microphone  
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post #7 of 7
bahaha
   
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