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4790K: Difference between VID & VCore - What are my true voltages? - Page 2

post #11 of 19
I never even bother running cache above stock. On your 4790k set it to 40 at 1.150v and dont worry about it.


Trying to keep it 300mhz below could limit the core overclock. You can come back and push cache up later but not necessary.

Just focus on core/vcore for now.
Edited by Wirerat - 12/8/14 at 9:46am
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post #12 of 19
Thread Starter 
I'm noticing how the C states helped a ton. Not only are my overall idle temps lower, but volts don't go as high as before. And only while stress testing they rise to 1.280 and fluctuate back to 1.267 and so forth.

Thank you for this.
post #13 of 19
Thread Starter 
Quote:
Originally Posted by Wirerat View Post

I never even bother running cache above stock. On your 4790k set it to 40 at 1.150v and dont worry about it.


Trying to keep it 300mhz below could limit the core overclock. You can come back and push cache up later but not necessary.

Just focus on core/vcore for now.

How could it limit the overclock?
post #14 of 19
My 4790k does 4.7ghz @ 1.32v with cache at 4.0 @ 1.170v.

If i raise cache up to 4.4ghz (300 mhz below) then my 4.7ghz 1.32v is not stable. Regardless of input voltage or cache voltage.

It needs 1.35v for 4.7ghz with 4.4cache 1.2v.

There is no special gain for having it 300mhz below. In the situation above its not worth raising cache at the expense of core stability.

Please read "ring bus doesnt matter" in the link below.

http://www.overclock.net/t/1411077/haswell-overclocking-guide-with-statistics/0_50

Overclocking cache is fine but never at the cost of core frequency. If lowering cache opens up another 100mhz core then that is choice you should always take.

My 4.6ghz 1.25v profile can have cache up to 4.5ghz. The 4.7 core 4.0cache is still faster.
Edited by Wirerat - 12/8/14 at 12:32pm
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post #15 of 19
Thread Starter 
Quote:
Originally Posted by Wirerat View Post

My 4790k does 4.7ghz @ 1.32v with cache at 4.0 @ 1.170v.

If i raise cache up to 4.4ghz (300 mhz below) then my 4.7ghz 1.32v is not stable. Regardless of input voltage or cache voltage.

It needs 1.35v for 4.7ghz with 4.4cache 1.2v.

There is no special gain for having it 300mhz below. In the situation above its not worth raising cache at the expense of core stability.

Please read "ring bus doesnt matter" in the link below.

http://www.overclock.net/t/1411077/haswell-overclocking-guide-with-statistics/0_50

Overclocking cache is fine but never at the cost of core frequency. If lowering cache opens up another 100mhz core then that is choice you should always take.

My 4.6ghz 1.25v profile can have cache up to 4.5ghz. The 4.7 core 4.0cache is still faster.

Got it. Thanks.

I'm having a hard time understanding why my volts go up to 1.265 on normal load when I set them to 1.250 on manual. When stress testing they even reach 1.280 according to Hwinfo.

Do you think 1.280 volts is a little high if I care about degradation? Is there (even the slightest) chance of it hurting my 4790K which I care much for? tongue.gif
post #16 of 19
Quote:
Originally Posted by Vioxtac View Post

Got it. Thanks.

I'm having a hard time understanding why my volts go up to 1.265 on normal load when I set them to 1.250 on manual. When stress testing they even reach 1.280 according to Hwinfo.

Do you think 1.280 volts is a little high if I care about degradation? Is there (even the slightest) chance of it hurting my 4790K which I care much for? tongue.gif

1.25v vcore isnt far off from stock volts on some 4790k's, so wouldnt be worried about that at all.

And intels integrated voltage regulator has a built in LLC logic that increases vcore at load, the end user has no control over it. So if you set 1.25 in bios that will set vid (called for voltage, ie vid) but the ivr can increase that by ~.02v or so at load (supplied voltage ie vcore). No getting around that.
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post #17 of 19
Thread Starter 
Immense amounts of help and knowledge acquired in just a day. You guys helped me tighten up my overclock in no time and I'm grateful, thank you all.

My final, stable results, for those interested:

4790K OCd @ 4.7 GHz with 1.250 VID and 1.265 VCore at load. Temps at idle are 30C, gameplay 54C, heavy load 65C,stress test 82C. I'm incredibly happy with it. From what I understand this is also an above average chip. biggrin.gif
Edited by Vioxtac - 12/8/14 at 2:43pm
post #18 of 19
Quote:
Originally Posted by Vioxtac View Post

Immense amounts of help and knowledge acquired in just a day. You guys helped me tighten up my overclock in no time and I'm grateful, thank you all.

My final, stable results, for those interested:

4790K OCd @ 4.7 GHz with 1.250 VID and 1.265 VCore at load. Temps at idle are 30C, gameplay 54C, heavy load 65C,stress test 82C. I'm incredibly happy with it. From what I understand this is also an above average chip. biggrin.gif
its is. Mine does 4.6 at that vcore.
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post #19 of 19
I know this is an old thread, but for what it's worth; I found that the Ring voltage would seem to run at about .100v less than the Core voltage, (+/- .015v). I spent more time than it was worth, messing with the Ring voltage and multiplier and set it back to Auto when I finally stopped fooling with it. That setting seemed to be best because I was able to get the CPU frequency to 4.9Ghz when I finally let the mobo decide what to do with the Ring.

As much as I read about the CPU Ring settings, and for all the time I researched it, I found I only increased my knowledge on the component enough to hurt me, lol. Still, that's not to say the CPU Ring settings wouldn't be important to a Bench-marker, I'm sure it would.

I was surprised to see the suggestion to "Enable" all the C State settings. When I looked into what they should be set to, I found that everyone insisted they should be Disabled entirely. This was what was overwhelmingly recommended for those who were trying to Overclock beyond the usual "Turbo" speeds.

I have mine disabled for the 4.9GHz profile which I only use for 'flight-simming' and I also disable the Hyper-thread option. However, for "everyday use' I run the CPU at 4.7GHz and the Hyper-thread as well as the C State options are enabled.

Like I said, "for what it's worth",
Rich
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