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CPU-Z Shows Core Voltage that is Lower Under Load than Idle- What is going on?

post #1 of 6
Thread Starter 
Hi all, I finally got my IB biggrin.gif (I'm a noob, been learning since a long time ago, but never got to do these)

I left my i5-3570k at stock to make sure nothing's wrong with it for the first 2 days
Then I started O'Cing with my AsRock Z77 Extreme 4, the CPU is cooled by NH-D14 (which I heard is as good as H100?)
As soon as I did that, I found it unusual that my CPU-Z shows lower voltage at 100% load than idle

At idle:

Under load: (prime or IBT, both give same effect)



My idle voltage is higher than load, why is that? (it's freaking me out)

I found it stable when I set the MoBo Vcore at 1.245v (prime crashed after like 19 hours, though, should I add more voltage?)

Also, none of these numbers are matching with the VCore I set on the Mobo, I know there's always some slight discrepancy, but this worries me...

Thanks for the help!
 
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post #2 of 6
I'm guessing you used a fixed manual voltage? What is your setting for LLC?

Sounds like you have little or no LLC, and when the CPU is under load your voltage is dropping (called Vdroop). If you set a medium setting for LLC you should keep a more consistent voltage under load.

And since, under load, your voltage drops all the way to 1.168 that is why you are getting crashes.
post #3 of 6
Thread Starter 
Oh, I was suspecting that Vdroop was the problem
I left them all on Auto since I didn't want to mess anything up...
medium setting for LLC, what voltage would that be about?
 
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Core 2 Duo E6300 @ 2.1 GHz Planning on getting P5B Deluxe (email me offerXD) MB one... 3G all Kingston PC4300 533MHz 
Hard DriveOptical DriveOSPower
320G DVD +/- RW Windows 7 x64 Ultimate oemed... 
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planning on moding my own at my school 
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IB Program
(11 items)
 
 
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Core 2 Duo E6300 @ 2.1 GHz Planning on getting P5B Deluxe (email me offerXD) MB one... 3G all Kingston PC4300 533MHz 
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post #4 of 6
Quote:
Originally Posted by gameg2l View Post

Oh, I was suspecting that Vdroop was the problem
I left them all on Auto since I didn't want to mess anything up...
medium setting for LLC, what voltage would that be about?

Keep the voltage you have set now, and just change LLC to Medium (or High) or 50% or whatever is in the middle of the range for your board. If you set 1.245V in the BIOS, then medium should give you 1.24 or so under load.
post #5 of 6
Thread Starter 
Thank you! I'm going to try it now,
+rep smile.gif
 
IB Program
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Hard DriveOptical DriveOSPower
320G DVD +/- RW Windows 7 x64 Ultimate oemed... 
Case
planning on moding my own at my school 
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IB Program
(11 items)
 
 
CPUMotherboardGraphicsRAM
Core 2 Duo E6300 @ 2.1 GHz Planning on getting P5B Deluxe (email me offerXD) MB one... 3G all Kingston PC4300 533MHz 
Hard DriveOptical DriveOSPower
320G DVD +/- RW Windows 7 x64 Ultimate oemed... 
Case
planning on moding my own at my school 
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post #6 of 6
I will not change anything except VCore. Especial if your temperatures are in check . If you already pass prime for 19 hours it is a good sign that you are on the edge of ideal settings.Rising VCore just for the one step will solve your problem with crash. thumb.gif
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Studio
(17 items)
 
Game I
(10 items)
 
Game II
(12 items)
 
CPUMotherboardGraphicsRAM
I7 3930k ASUS P9x79 VGA GeForce GTX 770 4GB Dual FTW w/ EVGA ACX Co... HyperX Predator (T2) - 8GB Kit* (2x4GB) - DDR3 ... 
Hard DriveHard DriveHard DriveHard Drive
Mushkin Enhanced Chronos MKNSSDCR240GB 2.5" 240GB Seagate ST2000VX002 WD20EZRX Kingston HyperX 3K SH103S3/240G 2.5" 240GB 
Optical DriveCoolingOSMonitor
Optiarc DVD RW AD-7200S SEIDON 240mm Windows 8 ASUS MX279 
MonitorPowerCaseAudio
ASUS MX279 Thermaltake 750W LC Power Infiltrator M-Audio Delta 1010Lt 
Audio
M-Audio FireWire Solo 
CPUMotherboardGraphicsRAM
I7 3930k ASUS P9X79  GV-N670OC-2GD  PXD38G2133C11K 
Hard DriveCoolingOSMonitor
Corsair Force 3 Noktua NH D14 Windows 8 ASUS VE278Q 
PowerCase
SeaSonic X750 Gold 750W  Cooler Master HAF 922 
CPUMotherboardGraphicsGraphics
I7 3930k ASUS P9X79 MSI N670GTX-PM2D2GD5/OC MSI N670GTX-PM2D2GD5/OC 
RAMHard DriveCoolingOS
PXD38G2133C11K Corsair Force 3 Noktua NH D14 Windows 8 
MonitorPowerCaseOther
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