Haswell Voltage

Jeps

Jeps

Jeps

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I've been overclocking my new 4770k and I've noticed something weird going on with the voltage. I've got my voltage set to 1.31 and have been using CPU-z 1.62 as well as CPUID within aida64 which both show my voltage as 1.31 all the time. However, I've just noticed HWmonitor and the asus AI tweak utility showing the voltage jumping up to 1.328 when I run a stress test. I've since upgraded CPU-z to 1.65 and its now also showing the jump up to 1.328v? It seems whatever voltage I set my chip runs at 1.328v when I stress test :confused:

Is this normal with haswell? And if so then whats the point of testing for stability at lower voltages if the chip is always going to run at 1.328 when stress testing?
 
Jeps said:
I've been overclocking my new 4770k and I've noticed something weird going on with the voltage. I've got my voltage set to 1.31 and have been using CPU-z 1.62 as well as CPUID within aida64 which both show my voltage as 1.31 all the time. However, I've just noticed HWmonitor and the asus AI tweak utility showing the voltage jumping up to 1.328 when I run a stress test. I've since upgraded CPU-z to 1.65 and its now also showing the jump up to 1.328v? It seems whatever voltage I set my chip runs at 1.328v when I stress test :confused:

Is this normal with haswell? And if so then whats the point of testing for stability at lower voltages if the chip is always going to run at 1.328 when stress testing?
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This is normal, there's a boost voltage for when the chip goes to high clocks. The adaptive voltage is added to normal voltage to make sure when chip stays stable when it clocks itself up and needs more power.

The point of testing for stability at lower voltages is because lower voltages make less heat and draw less power, but you don't want to be in the situation where your CPU seems stable at high clocks (when it's getting a voltage boost), but then is unstable at low clocks when it doesn't have the extra voltage to help it.
 
If you stresstest with AVX and adaptive voltage, Haswell overvolts.

Test the rig with fixed volts, and after 100% stability, you change to adapive to save power. (Or leave fixed, my gigabyte can't even do adaptive really.. But still downclocks properly with powersaving enabled).

No gaming/other programs will ever cause the overvolt, only stresstests.
 
Thanks for the replys guys. I have an asus maximus VI hero and have the voltage set using manual mode at the moment which should prevent any kind of voltage change as. It even prevents downvolting when the cpu underclocks itself.

I'll check LLC to see if that is the culprit. I think I have I set to max as ive always assumed its only a good thing when overclocking. Wasn't aware it could cause vcore to rise at full load.
 
Jeps said:
Thanks for the replys guys. I have an asus maximus VI hero and have the voltage set using manual mode at the moment which should prevent any kind of voltage change as. It even prevents downvolting when the cpu underclocks itself.

I'll check LLC to see if that is the culprit. I think I have I set to max as ive always assumed its only a good thing when overclocking. Wasn't aware it could cause vcore to rise at full load.
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Ideally, you want to use these new features. You don't want your chip running at full voltage all the time, you want it quiet and cool when it's idling, and then have more voltage only when it needs it. Haswell was designed to only use low power when needing low performance.

I've seen my 4770k system go anywhere from 6 watts to 189 depending what it's doing. I'd hate to think I was having to deal with the heat, noise and electricity bills with it running at full tilt when it wasn't actually doing anything.
 
Steampunk said:
Ideally, you want to use these new features. You don't want your chip running at full voltage all the time, you want it quiet and cool when it's idling, and then have more voltage only when it needs it. Haswell was designed to only use low power when needing low performance.

I've seen my 4770k system go anywhere from 6 watts to 189 depending what it's doing. I'd hate to think I was having to deal with the heat, noise and electricity bills with it running at full tilt when it wasn't actually doing anything.
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Yeah I'm using manual mode for the time being just to test stability while I dial in the voltage as I've read that running aida64 in adaptive mode causes the cpu to draw more voltage then you want it too. Mine is drawing more voltage then I want even in manual mode though which is the problem.
 
With my Hero VI, even with manual mode, the voltage goes down when idle.
You need to enable the C states in the CPU settings in the BIOS.
 
Does the voltage go down in gigabyte boards? I never see the voltage reduce even in idle yet I believe there's no adaptive voltage mode on gigas?
 
The problem is the CPU isn't using the voltage i'm setting in bios, its always using more and it seems to go in steps.

If i set between 1.295 and 1.305v in bios, the cpu actually uses 1.312 during testing. If I set between 1.306 and 1.324 it uses 1.328 and any more then 1.325 makes it jump up to 1.344v
 
yeah llc is kicking in,either use a lower level llc or switch to normal cpu voltage and fine tune with dvid

to add extra +0.0 ect to cpu v
 
Instead of posting a new thread, I thought I'd go here. I am overclocking my 4770k and I don't know which is the 'main' voltage I need to increase! I have CPU 'core' voltage, which the BIOS reports to be about 1.008, and then I also have CPU 'input' voltage which is about 1.8! But then, CPUZ gives a voltage of 1.1 to 1.2 and I can't see any voltage of 1.2 in the bios...

Also, what is the difference between Auto, Adaptive, Offset and Manual? I thought Auto was adaptive! I recall I set my old i7 to positive offset and it was stable for years...
 
Mirmo said:
Does the voltage go down in gigabyte boards? I never see the voltage reduce even in idle yet I believe there's no adaptive voltage mode on gigas?
Click to expand...

I can't get adaptive voltage on my giga, it just stays fixed but the frequency does drop in idle, just make sure you aren't running high performance in power options and the frequency will drop.
 
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