AsUS Z97 A 4790K OC voltage question ??

lsummer · Jan 23, 2016

Well i am new to OC and this is my first attempt and would like a small bit of Knowledge from the experts, Let get my gear out of the way,
ASUS z97-A updated bios .
I7 4790K
16 GB ram 2133 Low latency.
850 EVGA 750 Gold PSU
EVGA 980
My first question is Vcore voltage I am getting a reading of 1.88 Vcore in HW monitor Under the voltages Tab Is this Correct or is it high ?? if its high how to i lower it in the bios which one of the settings below do i use. i have read and read a lot, but cant seem to find the correct value for this item. I understand there is no set Voltage but is 1.88 to high for input voltage ?
// i have manually set the following
CPU CACHE VOLTAGE: MANUAL MODE

CPU CACHE VOLTAGE OVERRIDE: 1.15

CPU SYSTEM AGENT OFFSET MODE SIGN: +

CPU SYSTEM AGENT VOLTAGE OFFSET: AUTO

CPU ANALOG I/O VOLTAGE OFFSET SIGN: +

CPU ANALOG I/O VOLTAGE OFFSET: AUTO

CPU DIGITAL I/O VOLTAGE OFFSET SIGN: +

CPU DIGITAL I/O VOLTAGE OFFSET: Auto

CPU INPUT VOLTAGE: 1.88

Thanks
Lee Summer Struggling non computer guy..

Guest · Jan 23, 2016

Hi lsummer

Im gonna take a crack at this since you have the same CPU as me and an Asus board. Asus has something called Auto rules and that is default your bios, reboot, enable XMP profile to get proper timings and RAM voltage, set your multiplier to whatever you want and input manual voltage, don't touch anything else. Stress with Intel extreme tuning utility as most others will add extra voltage. One way is to set your multiplier to where you want and put something like 1.2v and if you crash then reboot and add more voltage until stable for at least 8 hours.

Another way is to see what your CPU default voltage in AISuite 3 is and bump it up from there in small increments until stable. This is how I got mine to 4.7 @ 1.2v. Overclocking requires a lot of patience and your BSOD will read Clock_Watchdog_Timeout.

Good Luck and keep us posted

sportsfanboy · Jan 24, 2016

Input voltage is the voltage that feeds the vrms on the motherboard that ultimately feeds the cpu it's power. generally you want that value .6 volts higher than cpu vcore.

1.88 input voltage won't hurt the chip, but what is the cpu vcore under heavy load. I would check this in hwinfo64

Guest · Jan 24, 2016

This is a really good read for you http://pcdiy.asus.com/2014/06/6-4970k-cpus-overclocked-oc-impressions-of-devils-canyon-on-asus-z97-motherboards/

Especially this section (I even copy pasted it for you)

UEFI Options and the benefits of ASUS auto rules
During the course of overclocking especially when working with a new chipset and a new CPU one key area I evaluate is the auto rule(s) experience. For those of you wondering what “auto rules” are, they are the automatic parameters adjusted within the UEFI in relation to other parameters being modified. An example would be if you modify your CPU turbo multiplier from auto to 46 ( effectively overclocking your CPU to 4.6GHz ) there are auto rules that will be automatically put into effect to ensure a smoother and simpler overclocking experience. These could be voltage parameters, cache ratios, OCP level ( over current protection ) and much more. These values are extremely important and defined only after thousands of man hours are put into tweaking and tuning the UEFI manually prior to the launch of the chipset and the CPU. For years ASUS’s UEFI auto rules have led the industry in respect to their consistency and quality. I am happy to report this continues under ASUS Z97 motherboards. Little to no advanced tuning is required. It is not a simple as the Auto Tuning ( automatec single step overclocking ) offered within the ASUS AiSuite III system utility which can overclock your CPU consistently and effectively based on a wide range of options including frequency or temperature and more importantly overclock your CPU specific to the margin of your CPU, CPU cooling, power supply and memory. So while not being as simple as the click of the button overclocking through the UEFI is extremely simple and effective.

So what values need manual adjustment? Just CPU voltage, enabling of XMP ( Extreme Memory Profile ) and entry of the desired multiplier. All other values are defined by the auto rules programmed within the UEFI.

lsummer · Feb 10, 2016

Thanks for the hepl
Hey sorry for the late reply i was away for work and just got home, so i tried to push the limit (newbe) i was at 48 multiplier and all seemed stable until i ran Prime 95 the temps went way to high to fast so i made some adjustments to the water cooler (Corsair) changed the compound and backed down the voltage leaving it at the 48. That lasted about an hour.. I loaded the flight sim with out any testing just to see the performance and crashed within 45 min.
So i lowered the OC to 47 set voltage at 1.26 and ran the prime 95 for 3 hours the temps did get to around 88C a few times but hovered at the 80c most of the time. I have been running this now for a week and it seems good i never get over 73c in load using the computer for my flight Sim (P3D&Xplane).
I am aware that it might get unstable in time but i will adjust if that happens for now i think i am done with the OC.

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AsUS Z97 A 4790K OC voltage question ??

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