4790K vcore not dropping at idle

samwise78

samwise78

samwise78

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So, I noticed that my Z97X SOC Force (F6 bios) was putting 1.240v through my 4790K at stock speeds, which I thought was a bit unneccesary..

So, I manually set the vcore to 1.1850v and as a simple test changed core multiplier to 45, as per http://www.overclock.net/t/1490835/the-gigabyte-z97x-overclocking-guide enabled C3 and EIST as want the power saving options at idle..

Rebooted and all seemed ok, did 5 x runs of Asus Realbench - temps no higher than 60 degrees across all cores, but noticed that vcore is 1.1850v throughout - even when idle.

I can see the multiplier drops automatically but voltage stays where I set it..

Sure I'm missing something obvious here but any advice/assistance greatly appreciated

Cheers
 
1.185v sounds about right ... I think my 4770k @ stock eats 1.175v ... Make sure your on balanced or power saving options ... Full power will keep CPU ticking over 100% , other than making sure nothing's keep load on the CPU and IST, and normal power saving features are on it bios
 
Thanks MasterOC

When the vcore was left at auto, power saving works just fine, so still downclocks to 800mhz and also downvolts to 0.7ish

As I wasn't overclocking straight away - I thought the Gigabyte chucking 1.240v through the CPU was overkill looking at what other people in the owner's thread were hitting on the same volts, so wanted to reign the volts in (before I overclocked)

Still downclocks fine after manually setting vcore, but doesn't downvolt for some reason
Will have another look this evening
 
It doesn't downvolt because it has been told to run at 1.185v. Using offset voltage allows the vcore to drop when idle.
 
Also, just make sure your on the latest bios for the board. Some early devils canyon compatible bios revisions would set a high vcore at stock. And in my case, uncore clock of 4400mhz as opposed to 4000mhz on the later version.
 
I'm on F6 bios for the board..

Just had a quick play in the bios trying to get to the vcore offset settings..
Turns out I had to type Normal in the vcore box to unlock the vcore offset - I assumed I'd want to set this to -.300 to drop the voltage by 0.300v when idle?

This doesn't seem to have had any effect - currently sat on desktop (idle) with HWiNFO64 reporting 1.185v at 800Mhz instead of dropping the voltage too..

Might just leave it as is for now unless anyone can give me a noddy step-by-step to achieve this!

Cheers everyone
 
Quick update..

Although HWiNFO64 is reporting voltage static at 1.185v - if I open up Easytune the summary box shows the CPU downvolting (which is what I want) to 0.76v - 0.86v

CPU-Z matches HWiNFO64 and shows 1.185v..

So which do I trust?

:confused:
 
Hi McGraw, sorry didn't see you reply

If I manually set the vcore in the BIOS to 1.185v then it shows up in CPU-Z and and CoreTemp (for example) as 1.185v too.. In CoreTemp this shows as the VID.

Still no further forward with this, not sure I trust Easytune or not, as everything else I look at isn't showing any downvolt at idle when vcore set manually..

When using offset on the SOC Force, you set vcore to Normal to "unlock" the offset, but once you have your offset values, as vcore is set to Normal that ditches the 1.185v value I had in..

Is there a way to make the manual vcore of 1.185v stick and keep the offset??

Thanks
 
Take it all back, looks like McGraw you were spot on.

Just tried this again, set vcore to Normal, set offset to -0.030v, then set vcore to 1.185v..
Enabled C3 and EIST..

Booted into Windows and HWiNFO64 is reporting VID now 1.185v..
Waited a minute or so for power saving, drops to 800Mhz, VID at 1.185v still.

Scrolled down further and vcore is indeed dropping to between 0.76v - 0.82v as desired.

Live and learn!

Thanks to everyone who replied

:D
 
I haven't really found a need in real world use just yet but I'm sure the urge will take over, just wanted to get a decent (cool) baseline and take it from there..
 
I came across this thread while researching WHEA_UNCORRECTABLE_ERROR with my 4790K on gigabyte z97x soc force with F6 bios.
After my machine is idle for some time it shuts off and lands on the boot failure screen. Research to the error mentioned indicates CPU vcore issue. I am trying to produce a nice cool temp whilst gaming in BF4 so I have manually set vcore to 1.191 which is stable when playing or using the machine but after about 20 mins at idle it dumps. Possibly due to the vcore not dropping when idling ?

I wish to try the same as samewise but am unclear as to what C3 and EIST are and where to enable them. Any help you can give would be great.
 
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I could be wrong, but gut feeling is that your crash won't necessarily be due to the vcore not dropping at idle..
All I did (apart from posting here for help) was use the following link for guidance:
http://www.overclock.net/t/1490835/the-gigabyte-z97x-overclocking-guide

What other settings have you configured in the BIOS along with manually setting vcore?
Be useful to see screengrabs from the relevant sections..

Cheers
 
Thanks for the replies guys. I seem to have it working stable now as I left it idle for almost an hour last night without an issue.

I am not 100% certain what the cause was however but what I have done is to return all bios setting back to default other than using the XMP profile on the ram.

What I think has actually fixed the concern though is uninstalling XTU from my machine as I was using it to limit Boost wattage and amperage. Once I uninstalled XTU and just let it boot and sit it seems to be fine.

I had been using XTU to try and cool the processor down but I have made some adjustments to my case(Antec 300) fans so with everything on auto(1.25 volts vcore) its running around 55c to 60c when gaming. I may have another play with lowering voltages to get it cooler but I think those temps are OK.
 
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