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Maximus VII Hero voltage control help required

sherriffjb
Level 8
So Im used to overclocking with x58 - that's the last time I upgraded prior to this.

The Bios and voltages are getting on my wick

There seems to be some inherent LLC even when I - as far as I can tell- have it turned off in the bios, I want to set my voltages at 1.31v for 4.8 on a 4790K

If i use manual it ends up closer to 1.33 and Offset and Adaptive are messing with my mind.

When I set an amount of offset and turbo voltage which equals 1.31v the cpu has drawn 1.4 and on one startling occasion nearly 1.5v before I pulled the plug (literally and very quickly) so i think I must be doing something wrong.

Offset yields better results through more predictable voltages but still will not give me any fine control and when i set the voltages at anywhere between 1.295-1.31v the board without fail pulls 1.328

I am finding it impossible to set up any kind of precision voltage control, am I doomed to have to run at 1.328, when all i need is 1.31? Is it me missing something glaring obvious or have I been stripped of that kind of fine control that I want with this board?

Advice, correction and everything else are requested and welcomed.
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44 REPLIES 44

sherriffjb wrote:
I have turned off the option for the vrms on die to communicate with the board and request more voltage.


I have played around with this option but Im not sure if it works on Haswells as the on board reg on these cpus is embedded within the cpu's architechture and I would be surprised that it could be over-ridden by the mobo.

NemesisChild
Level 12
I just built a new rig for my son, Hero VII with my old 4770K.
Flashed to the latest bios (2201) right from the start, my voltage is dead on in both manual & adaptive modes.
It actually took me by surprise how accurate the voltage was compared to my bios setting.

Your chip may just have a wacky voltage controller or something is funky with the board...I'm leaning towards the CPU.
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NemesisChild wrote:
my voltage is dead on in both manual & adaptive modes.
It actually took me by surprise how accurate the voltage was compared to my bios setting.


What are you suing to measure the core voltage and are you comparing the voltage when idle Vs heavy load [eg stress test etc]?

The core voltage should increase under load - that is how the cpu is designed. Also note that the 4790K is slightly different as far as the on board integrated voltage regulator is concerned as compared to a 4770K.

Given that my llc calibration seems to also have no effect on the voltages at all im inclined to think its the board, as all of these features are driven by the board itself.

sherriffjb
Level 8
using the voltage on OCCT, ai suite, cpuz and hwmonitor and my voltage does not only hit these levels at heavy load, whenever it hits higher clocks even if its just opening a new window or loading an application it happens. Under very heavy sustained load ai suite and occt read occasional split second spikes to 1.344, I never see it for longer than it takes for me to blink, but my load voltage is never very static it tends to wobble around, something is defo wrong, I can't tell if its the cpu or the board. However after your post Coastas showing your volt range i'm inclined to think its a "feature" of the board, after hitting google up a little other poeple who seem to rreport this are all on asus boards.

ALso costas yes the 3 wirse system is built into the cpu but it's still sending a siganl to the pwm on the board when it wants to call for more voltage, s all that needs to happen is for svid to cancel that out at a software level on the board,...perhaps my software aint quite right

I guess I will have to resign myself to letting this chip die an early death from degradation which it surely will peaking t at 1.344 when set at 1.31.... thats a large diffrence and moves the voltage from a range where its cool for 24/7 use into right into an area thats slowly murdering it. I just hope it lasts till broadwell.

If broadwell does the same thing then I know it's the board an i'll RMA or simply to a different manufacteror of board

Once again thanks for the replies guys

@ Nemesischildwhat are you using to read the voltage? and as Costas said the chip has a different set of vrms on it so it will behave differently to a 4770

Costas
Level 10
1.34v is nothing to get too excited about....esp if it only is there for short bursts.

The reason you see the voltage jump when a window opens or a program is started is that the cpu will pre-empt the voltage required and then workout what voltage it actually requires. So it sort of overshoots for a short period.

LLC will affect this somewhat but the LLC features are also dependent on which C states are enabled or disabled.... By default these are not enabled in bios.

From what I have interpreted in your posts I see this as normal behaviour and is not specific to the Hero or Asus mobos.

If you have not already done so, headover to Overclock.net and lookup the Devils Canyon owners thread for some useful info.

llc is off, i cant stress this enough and rather than vdroop im getting overvolting, that is not normal behaviour

lets render this down to a simple question:

With LLC off should my voltage be lower or higher than the value set in the bios?

sherriffjb wrote:
llc is off, i cant stress this enough and rather than vdroop im getting overvolting, that is not normal behaviour

lets render this down to a simple question:

With LLC off should my voltage be lower or higher than the value set in the bios?


You may want to double check this point but I believe that LLC mainly affects Vring and not Vcore...?

LLC is desigend to counter vdroop

Vdroop manifests because when dynamically changing clock and voltage the cores are subject to large fluctuatons and in general there is a slight amount of vdroop between the bios setting and voltage the cpu pulled, back in the days before llc you had to offset it manually by inputting a higher vcore than the chip needed to run to hit the vcore you wanted.


How familiar ar eyou with vdroop?

Sherrifjb, I see the same behavior on my set up. It behaves as though the CPU or the motherboard maps a range of Vcore values to one fixed value. If I set my manual Vcore anywhere between 1.150 and 1.200, it always uses 1.232 at load. I also haven't been able to figure it out.