Voltage and multiplier issue [4790k/Asus z97-A]

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E

entangle

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Nov 20, 2014
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So I've been tinkering with my new CPU and got some issues with the voltage. The board I got is an ASUS z97-A with a NH-D15 cooler.
My goal is to have adaptive voltage and then increase the clock later. I am aware that the Devil Canyon's can add about 0.1V when adaptive voltage is enabled. However, my voltage seems to consistently continue to increase whenever I increase the multiplier. This only happens when turbo is enabled (when I go over 40x multiplier). When I set the multiplier to 40x with adaptive voltage the voltage stays at what I set it at (max 1.050V).

This is the result with Additional Turbo voltage set to 1.050V and Offset set to auto. (I get the same result with a fixed amount for the offset)

Mult| V load| V Increase
40x | 1.050 | 0
41x | 1.090 | 0.040
42x | 1.145 | 0.095
43x | 1.195 | 0.145
44x | 1.250 | 0.200

I also tried; setting the offset on a fixed value and CPU voltage on auto, and setting both to actual set values. It still increase the voltage with the multiplier, except when I disable turbo.
I don't even have to start a stress test to get these voltages. It goes up to these values when I boot windows and then lowers it when the multiplier goes down again.

To summarize; what I want is to be able to go over 40x multiplier with adaptive voltage without the voltage going (too much) over what I set it to do. I was able to get to 4.6 GHz with around 1.2V manual, and that is what I aim for but with adaptive voltage.
Is there some easy option that I am simply missing?

Thanks for the help!
 
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E

entangle

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Nov 20, 2014
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4,510
To my understanding lower voltages will reduce the temperature and also increase the life span of the cpu (it might be negligible?). Also reduced power consumption. Why wouldn't I want to use it? Is there some better benefit with any of the other modes besides better stability when running stress tests? To me adaptive seems like the best option.
 
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frag06

frag06

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Mar 17, 2013
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Just set voltage manually. As long as you have EIST (Speedstep), C1E, and your C states enabled, voltage will not be constant (i.e. it will draw what it needs and scale down at idle).

Using Adaptive with Haswell isn't a good idea. Certain programs (e.g. Prime) will seriously jack up the voltage, which is something you definitely do not want.
 
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E

entangle

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Nov 20, 2014
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I have set voltage manually and enabled all the C-states that I can, aswell as Speedstep. The voltage doesn't move for me at all (http://i.imgur.com/aonEJKO.png). Speedstep and power consumption seems to be working. Is there something that I might have missed?
 
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E

entangle

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Nov 20, 2014
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That explains a lot of things. Certaintly a bit confusing but does make me a bit calmer. So what is the VID reading in HWMonitor monitoring? (This is the same reading as Core Voltage in CPU-Z for me. It is also varying when adaptive mode is on, so that made me assume that that was the reading to monitor for core voltage). Can I pretty much ignore that one then and start reading from VIN4 from now on?

EDIT: Oh, so the VID reading is what is actually SET in the BIOS? I guess that is what is the difference beteween doing it this way with manual mode compared to adaptive.
 
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