Gigabyte Z97X-UD5H-BK and 4790K; Always on Turbo Boost/ 4.4ghz+Question of XMP

ThatDude- · Aug 12, 2015

Hello there, I recently built a new computer and I have a few questions.

I have not touched anything in the BIOS, other then just looking at how things are going on there. I found that my 4790K is running at Turbo Boost, constantly, at least in the BIOS, it shows 4.390 Mhz, whenever I enter the BIOS, which is basically 4.4ghz, which is the max of Turbo Boost on this CPU, from what I gather.

This is what appears on the BIOS:

CPU Core Frequency

4390.85Mhz

CPU Vcore
1.236V

CPU VRIN
1.776V

CPU VAXG
0.012

CPU Temperature
31.0 C

CPU Fan Speed
766 RPM

Are these settings good or is the voltage to high? Will the CPU be fine running this at all times?

Is it possible to manually set better settings here or should I leave it alone? Also, I installed CPU-Z and I dont get the same stats there as in the BIOS, they do change sometimes though when running games but quickly change after alt tabbing or closing the application in question. I suppose idle stats on Windows is different then idle time on BIOS?

Another thing that is bothering me, is that I have 2 sticks of RAM modules, each 8GB, so 16GB of ram, Corsair Vengeance Pro. They are set on dual channel mode, at least if all it takes is putting them on their corresponding RAM slots, which the MOBO manual said was slot 3 and slot 4.

However, their speed frequency is advertised as 2400mhz, but from what I understand, I need to use XMP to bring them up to 2400mhz.

At the moment, the RAM modules are running at 1330.52Mhz, with the voltage of the RAM being 1.500V.

I tried to enable XMP Profile 1 (Profile 2 did not appear at all under the options). After enabling XMP and restarting, the voltage of the ram went up to 1.65V. Would that voltage be fine? What was bothering me and made me disable XMP, was that the color of the text on the RAM voltage in the BIOS, changed from white to yellow. Is that normal when you enable XMP?

Also, coming back to the CPU, which was already running at max Turbo Boost, 4.4ghz, on the BIOS. After enabling XMP, it went up to 4.5ghz. Is this normal?

From what I had read before on the net, when you enable XMP, Turbo Boost gets enabled, and I thought well, sure that seems fine to me, as long as it doesnt exceed 4.4ghz, as I did not want to overclock the CPU.

But the situation I find myself in is that Turbo Boost is already activated, BEFORE enabling XMP, at which point I basically would be overclocking the CPU, going over the 4.4ghz limit of the CPU, passing into overclocking territory.

Any recomendations on how to procced so that the CPU is not constantly running with Turbo Boost enabled, prior to enabling XMP, and that later with XMP enabled, it does not exceed the 4.4ghz limit?

Tradesman1 · Aug 12, 2015

The DRAM is fine 1.65 at 2400 is the norm, sounds like at some point the CPU was OCed, the 1.23 is well above norm for CPU voltage, do you have system software for managing the mobo/OCing, etc Might try resetting the CMOS and see what the CPU is at does, if still high and the vCore (CPU voltage) is still high then there's something wrong somewhere.

ThatDude- · Aug 12, 2015

Tradesman1 :

Thank you for the response!

Good to hear about the voltage of the ram, but yeah I was abit worried about the voltage of the CPU. The thing is, ever since first booting the machine up, the BIOS seems to have set those settings on its own, I believe because basically everything is on AUTO.

The very first time I booted it up the CPU frequency was at 4.390mhz, which alarmed me at first, but since the temperature has mostly been fine, I havent been that worried. The temperature is at idle mostly from 30 to 37 C. If the room temperature is optimal, the idle temperature of the CPU is around 24 C.

Under what I think is a heavy load, like running Arma 3 and Max Payne 3, the temperature of the CPU has been up to max 58 C, but that is it, no further then that. The CPU cooler that I am running is a Noctua NH-D15S.

But now I am here, I thought I should at least see what other people say.

Any advice on what voltage I should be running the CPU at? Like what settings should I set CPU Vcore and CPU VRIN and anything else that I might need to change in the BIOS?

Tradesman1 · Aug 12, 2015

Temps are OK, try setting the the vCore to 1.19 or so and see what it does

ThatDude- · Aug 13, 2015

Tradesman1 :

Okay, I will have to try that then, but what about the setting of the CPU VRIN? Does that change automatically as a result of changing the vCore?

blasc · Aug 13, 2015

since i have a mobo also from gigabyte and also a 4790K, my experience is:

-Like you stated before, the max freq of the RAM only "comes alive" with XMP turned on. so that is out of the way.

-In almost all cases i've read around on forums, the default voltage that the BIOS comes with for the CPU, is simply too damn high. i have my CPU overclocked at 4.7 on ALL cores (default is core 1+2 at 4.4, core 3 at 4.3 and core 4 at 4.2 max if i recall correctly) and with 1.25 Vcore. so with your voltage, you should be on 4.6GHz or something like that ^^

-I created many profiles on the BIOS for my CPU. one of them was all cores on 4.4 @1.13 (if i recall). so your voltage is too high. start by bringing them all cores to same clock, and start lowering the voltage.

-Leave the Vrin alone on auto for now. only mess with it when you start doing some high ground overclock.

- what you can mess with, is the cache ratio. put it manualy on 4.0, and bring the voltage down (should be the voltage ring/cache/uncore or some of these names).

EDIT: i forgot to mention that when you enter the BIOS, the CPU is clocked at max available (in our case the default max is 4.4GHZ) in order to detect if it can maintain that speed without errors. That is why you see the CPU is on max clock when you go to the BIOS. It's normal don't worry

Post your temps after

dont forget to activate the C-states and energy saving options on BIOS after messing with all that.

Edit2: i forgot to tell you, after you put all cores on 44 multiplier, put vcore on 1.5V. Boot and stress test. If all is ok, go back to BIOS and lower to 1.4V -> stress test -> 1.3V................. When you crash go up (if crash on 1.3, go to 1.35, etc etc).
This way, you get the optimal temperature and power consumption, for that clock speed

Don't worry with system restarting/crashing too many times, or having blue screen. The worst thing that can happen are some corrupt files on windows, but system will be fine

ThatDude- · Aug 17, 2015

blasc :

Hello blasc, thanks for the response! I have not been able to use the computer the last few days so havent been able to check and update on things. This is the first build I do and I am learning as I go.

I tried to lower the voltage, and brought it down to 1.20v and all cores on 4.4ghz, but then the adaptive voltage got desactivated.

The mobos BIOS does not have an adaptive option for me to use, although that was somehow activated under optimized defaults, it worked fine before. The downclocking worked fine though, as long as I chose power saver mode under windows. Sometimes Balanced worked, sometimes not.

The voltage stayed the same though, I suppose once I choose a voltage setting for the vCore it gets set to static. Also, while using CPU-Z, it showed 1.20v but under the BIOS, it said the vCore voltage was at 1.28 and under the BIOS it seemed that I could not pull it any lower. Yet on windows it did detect the 1.20v that I had selected..

My question now I suppose, is should I use the optimized defaults of the mobo or keep the manual, static voltage that I set? And if keeping the manual vCore voltage, is there any danger with only changing that setting or should I change more settings along with that?

To recap, the mobos optimized defaults for the vCore is at 1.236V and the CPU VRIN is at 1.776V.

I decided to go back to optimized defaults for now, just to make sure I have not missed any other setting that I should use.

I would rather lower the voltage as much as possible while maintaning all cores at 4.4ghz, so I get as low temperature as possible. Also, if possible to enable adaptive voltage as well.

I read something about vCore Offset and that it might be the way for enabling adaptive voltage but would like to know if I should mess with that or not and if so, how should I proceed?

P.S: While gaming (Arma 3) the temperature went up to around 55c and maxed out at 58c. Is that normal with the voltage the mobo is running the 4790k at; CPU Core 1.236v and with the CPU cooler Noctua NH-DH15s?

blasc · Aug 17, 2015

your temps are good, but they are good because you have a high quality cooler. If you were still using the stock one, you would notice the difference (I was forced to initially undervolt my CPU and learn the hard way, because I initially only had the stock cooler... lol).

The thing is, with the equipement you have (CPU+mobo) the objective is always to get better numbers (benchmarks, speeds, temperatures, energy consumption, etc.), because it is flexible and it allows you to mess with it. So get those temps and energy consumptions down

basically, the knowledge i have is all from here:
http://www.overclock.net/t/1411077/haswell-overclocking-guide-with-statistics
and here:
http://www.overclock.net/t/1401976/the-gigabyte-z87-haswell-overclocking-oc-guide

It explains almost everything that there is to know about the meddling of the BIOS, clocks and voltages. The principles for Overclock, also apply to undervolt/downclock. And basically what you are doing (all clocks on 44x Max, and voltage down) is overclock and undervolt at the same time.

and regarding the terms offset/adaptive/static:

- Offset: http://cdn.overclock.net/a/a5/350x700px-LL-a55ab556_bios2.jpeg
Or in other words, you add or subtract a certain value to the default voltage
OffSet = -0.1V
Vcore = VcoreDefault - 0.1
And this translates ALLWAYS, no matter if its idle, on load, etc.

- Static:
basically you put a certain value on Vcore, and disable the energy saving profiles (C-states, speedstep, etc). That way, it is ALLWAYS on that value, but dont worry, it only heats up on load anyway. But of course, it isn't optimal, and it is usually used only for tests to see where you can get your clock.

- Adaptive:
C-states and energy saving stuff all turned on. Max value of Vcore set to a certain level, but the processor won't go there unless it is on load, in order to save energy.

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Gigabyte Z97X-UD5H-BK and 4790K; Always on Turbo Boost/ 4.4ghz+Question of XMP

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