Experiencing CPU Overvoltage for OC [i5 2500k]

shobster

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Sep 26, 2014
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Intel i5 2500k, blast from the past.
Mobo: ASUS p8z77-v LK

I'm overclocking my motherboard running 4.8GHZ OC'd @ 1.33v. Well, that's the voltage I told my bios to set it, but HW Monitor is saying 1.456v which is way more than it needs.

So far in my BIOS.
CPU Voltage [Manual Mode]
CPU Manual Voltage: 1.330
LLC: Extreme
Internal PLL Overvoltage: Disabled
CPU Current Capablity: 110%
CPU Fixed Frequency: 250
CPU Power Phase Control: Extreme

Really what I'm asking for is I want my voltages to be stable under load @ 1.35v. I feel like I'm missing another setting in the motherboard that's giving me overvoltage I need to disable.

Thank you guys for taking your time to read this and any help you can give.
 
Solution


That's exactly what's happening. With LLC on extreme, you can expect to see +0.04V at idle and +0.1V at 100% load. For it to just cancel out Vdroop without overvolting, you usually have to set it for "High."
try another option at LLC, while "extreme" should be the one keeping your vcore closest to the value u assign it, many ppl has reported over the years that that's not the case. Seeing you also have this "CPU Power Phase Control" you might also need to play with it.

Also what PSU do u have and since when? It's possible that your PSU might no longer be able to provide the stable voltages u need for your OC.
 

shobster

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Sep 26, 2014
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About the CPU Power Phase Control, apparently everyone including Asus themselves says to keep it on "Extreme", the other option only available to choose was "T. Probe".

I have an EVGA SuperNOVA 1300 (1300w) and I've had it since February 2015.
 

shobster

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Sep 26, 2014
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I'm looking at VID. Vcore is pretty close to what I'm asking for despite a +/- 0.10v margin.
CPUZ (Vcore) says I'm getting 1.33V.
Coretemp (VID) says I'm getting 1.45v.
 

shobster

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Sep 26, 2014
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If I'm understanding this right, does that mean my current LLC mode is compensating for Vdrop and feels I need 1.4V(VID) to have a stable clock of 4.8ghz at load? So 1.33v isn't good enough to run my processor @ 4.8ghz?
 

shobster

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Sep 26, 2014
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Another bit of info:

When I set CPU Manual Voltage to CPU Offset Voltage, my Vcore goes below or above my offset. Although, setting to Offset actually makes Prime95 stable, but since my VID still goes more than I need, the temps increase dramatically.

UPDATE: Running Prime95 and my Vcore and VID are actually pretty close to each other now

VCore: 1.45v
VID: 1.47v

Regardless, both are still over my offset.
 

shobster

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Sep 26, 2014
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Got it, so I'm paying attention to my Vcore value now.
Vcore is currently at +1.4v~

I set my CPU Manual voltage to 1.350v and LLC: Extreme, so I'm a bit confused on as to why my processor is still have Overvoltage. Could my LLC just be raising voltages on its own?
 

scuzzycard

Honorable


That's exactly what's happening. With LLC on extreme, you can expect to see +0.04V at idle and +0.1V at 100% load. For it to just cancel out Vdroop without overvolting, you usually have to set it for "High."
 
Solution