CPU voltage goes higher than its meant to

[ExcitezR]

so i have had my i7 4790k for a while and had it under volted but i notice that some times it will ramp up the voltage for a split second 

 

I have it in the bios as adaptive with a core voltage of 0.069v with a negative off set of 1.219v and that gives me a voltage of 1.150v for the cores but i notice when at the desktop or in games i see the voltage go to 1.199v i dont know why this is i have the load line calibration set to 1 with is 0% on asus boards any one know why?

 

oh yeah the CPU is stable at 1.150Vs because i tested it on manual mode with adia 64

[ben dover kid]

i noticed the same when i ran prime95(i have i5 4690k). my voltage also goes above the limit i have given it at times. idk why, i havent kept it as a big deal, and maybe neither should you.

[HrutkayMods]

it's just the chipset stabilizing itself, it'll supply a little more voltage to the CPU when it needs it

[ExcitezR]

it's just the chipset stabilizing itself, it'll supply a little more voltage to the CPU when it needs it

is that not what load line calibration is for  

[HrutkayMods]

is that not what load line calibration is for  

that's exactly what it is I believe

[Ansau]

You have adaptive mode, so the cpu will take a bit more voltage if needed when working at full load. Offset works like adaptive, but it does not overvolt at full speed like adaptive.

Also, in Haswell, Load Line Calibration only affects VCCIN, not vcore.

[ProKoN]

its prolly a result of how your mainboard implements offset voltages.

 

set a non offset voltage if 1.15V and see if the behavior is consistent. looks like you did this with aida64

 

there is really no need to use a voltage offset with haswell. use a straight voltage in adaptive mode.

[ExcitezR]

You have adaptive mode, so the cpu will take a bit more voltage if needed when working at full load. Offset works like adaptive, but it does not overvolt at full speed like adaptive.

Also, in Haswell, Load Line Calibration only affects VCCIN, not vcore.

How does offset mode work? 

[Ansau]

How does offset mode work? 

 

Offset adds a small amount of voltage you decide to the whole normal curve of voltage set by default (which is flat on full load). Let's say normal voltage is 0.10v at idle and 1.10v at full and you add +0.05v offset. Now idle voltage will be 0.15v and 1.15v for full.

Adaptive uses the same normal curve, but at full load it can add as much voltage as it needs. In some stress tests the voltage bump can be 0.05-0.1v more than what you put, and that's why it is recommended not to use it when testing.

[ExcitezR]

Offset adds a small amount of voltage you decide to the whole normal curve of voltage set by default (which is flat on full load). Let's say normal voltage is 0.10v at idle and 1.10v at full and you add +0.05v offset. Now idle voltage will be 0.15v and 1.15v for full.

Adaptive uses the same normal curve, but at full load it can add as much voltage as it needs. In some stress tests the voltage bump can be 0.05-0.1v more than what you put, and that's why it is recommended not to use it when testing.

ok so when i go to the bios i see this on my off set but the offset voltage looks low compared to stock how would i achieve 1.150Vs 

 

[Ansau]

ok so when i go to the bios i see this on my off set but the offset voltage looks low compared to stock how would i achieve 1.150Vs 

 

 

I have a MSI MB, so I cannot help that much with asus settings. But I have an option called Override+offset, which allows me to set a base voltage and add or take the offset. if you don't have it, increase the offset voltage until you reach the desired.

When using offset, cpu-z only shows base voltage, but not the offset. HWinfo, IETU and other measuring programs show the correct.