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Haswell Overclocking Guide [With Statistics] - Page 1902

post #19011 of 19652
Quote:
Originally Posted by Benjiw View Post

I have an EVGA 750 G2 so unless it's faulty then it could be but given it won't do it with a milder overclock like a few mhz less (same voltage etc) then I don't think it's that. Once my loop is back up and I've got certain things out the way I'll try the OC again. I don't care if I fry the chip I'll replace it with a 4790k if it dies and run that bare too.
Quote:
Originally Posted by Benjiw View Post

I have an EVGA 750 G2 so unless it's faulty then it could be but given it won't do it with a milder overclock like a few mhz less (same voltage etc) then I don't think it's that. Once my loop is back up and I've got certain things out the way I'll try the OC again. I don't care if I fry the chip I'll replace it with a 4790k if it dies and run that bare too.

Haha sounds good! have fun at the bench thumb.gif

I just replaced my 4690k with 4770k and i'm having wierd problem with voltages varying on cores only the last core is running on the voltage i set 1.29 and 3 others somehow manage to get 1.38 from somewhere. here's a pic https://www.dropbox.com/s/cfx72zyagegbg4f/voltage_varriety.JPG?dl=0
post #19012 of 19652
Your CPU has a single voltage feeding all of your cores so at any instant in time, all active cores will be locked to the same multiplier and the exact same voltage. VID voltage in that chart has nothing to do with the actual voltage going to each CPU core so I would ignore it.
post #19013 of 19652
Quote:
Originally Posted by unclewebb View Post

Your CPU has a single voltage feeding all of your cores so at any instant in time, all active cores will be locked to the same multiplier and the exact same voltage. VID voltage in that chart has nothing to do with the actual voltage going to each CPU core so I would ignore it.

While all active cores are at the same voltage and frequency, some cores can be in lower power and frequency idle C-state. Depending on how the voltages and frequencies are sampled and averaged for display could lead to different values.
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post #19014 of 19652
Do the vrms provide a single voltage split to all cores? Or is there a separate vrm for each core? Can't be, right? So no way for cstates to drop voltage to just one core...unless there's a way to cut power to it completely, i guess.
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post #19015 of 19652
Cores in the deeper C States like C3 / C6 / C7 are considered to be inactive. In this state, they are disconnected from the voltage rail and getting 0 volts. They will also be disconnected from the main clock so will be running at 0 MHz. Monitoring software cannot accurately report this because it needs to wake up the core to find out what it is doing.
post #19016 of 19652
Quote:
Originally Posted by jdorje View Post

Do the vrms provide a single voltage split to all cores? Or is there a separate vrm for each core? Can't be, right? So no way for cstates to drop voltage to just one core...unless there's a way to cut power to it completely, i guess.

Read the 4th gen core family desktop vol 1 datasheet
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post #19017 of 19652
Quote:
Originally Posted by unclewebb View Post

Cores in the deeper C States like C3 / C6 / C7 are considered to be inactive. In this state, they are disconnected from the voltage rail and getting 0 volts. They will also be disconnected from the main clock so will be running at 0 MHz. Monitoring software cannot accurately report this because it needs to wake up the core to find out what it is doing.

Not all C-states are 0 volts, only C6 and C7 are. The others are not disconnected from the voltage rail as their cache and other state must be maintained. C3 stops the clock but is not 0 volts. There is also C1E which is low power.

Edit: Maybe you are partially right. The C-states that do have volts but low power may be at the same volts as active cores. That sounds about right, will have to research.

Well C1E says auto halt state with lowest frequency and core voltage combo, so I guess it and c3 can be at a lower voltage and frequency than active, but I agree this sounds a bit too complex.
Edited by GeneO - 6/21/16 at 10:50pm
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post #19018 of 19652
Quote:
Originally Posted by jdorje View Post

Do the vrms provide a single voltage split to all cores? Or is there a separate vrm for each core? Can't be, right? So no way for cstates to drop voltage to just one core...unless there's a way to cut power to it completely, i guess.

Your right.

The language about C1E and lowest voltage and frequency in the data sheet was confusing to me until I read about the history of why C1E was created. With your comment about a single rail this finally crystalized for me. What is meant in lowest voltage and frequency for C1E means it can run at the same lower speed step voltage as the active cores. C1 cannot do that - it has to run at full voltage.
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post #19019 of 19652
Hey guys,

I have a Motherboard : Asus Maximum VI Extreme
CPU : Intel I7-4770k
Cooler : Noctua NH-D14.

I'm trying to Overclock my CPU to 4.5 GHZ and so far it seem's like there is no way i will ever be able to achieve it.
Most of the time, when running Blend test on Prime95, temperature is not a problem (70-80C top) but it just restart or crash randomly while doing the test.

So far my top 2 setting are as follow.

1st
4.2 GHZ
1.29 Volt
Everything at Auto

2nd
4.3 GHZ
1.31 Volt
Everything at Auto

I'm not too familiar with Overclocking even tho i looked at many different guide and youtube video.
Any help would be appreciated.

Thanks!
post #19020 of 19652
HW doesn't clock as well as DC.
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