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Troubles with adaptive voltages with 4790k. - Page 3

post #21 of 29
Quote:
Originally Posted by disengage View Post

OK but what about the core voltage in cpu-z? Or the AIDA64 cpuid, both show core voltage as 1.18, and they don't undervolt like they do at default...

They're showing the VID, not the Vcore. It's an AIDA64/CPU-Z issue. Specific versions of CPU-Z show the Vcore, but I believe they switched to VID for good a while ago.
Quote:
Originally Posted by Blameless View Post

VID is just voltage identifier. If the load line aren't tampered with, this is the maximum voltage the CPU will see at that setting, there is vdrop, a small offset for the idle voltage, and vdroop, based on a load line spcification that lowers voltage as current goes up. VCC is the actual voltage delivered, and the load line causes this to differ from VID by design.

vcore settings in the BIOS is synonymous with VID, unless you turn on LLC or use offset voltages.

These explain things in more detail:

http://www.anandtech.com/show/2404/5

http://www.anandtech.com/show/2727/evga-x58-classified-first-look/6

Edited by B!0HaZard - 1/12/15 at 11:31pm
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post #22 of 29
Thread Starter 
Quote:
Originally Posted by B!0HaZard View Post

They're showing the VID, not the Vcore. It's an AIDA64/CPU-Z issue. Specific versions of CPU-Z show the Vcore, but I believe they switched to VID for good a while ago.

I SEE. So I am not pumping a constant 1.15 into my chip then? Here is a stress:

I see that my vcore is also much more than in CPU-Z or AIDA...
post #23 of 29
No, you're not.

It's not much more. 0.018 is not a lot... Was it set to 1.18 V in the BIOS? If so everything looks excellent. Personally, I would keep my System Agent at 0.925 V, but if it's just set to auto that'll be fine too.

Also, funny that HWMonitor is showing the VCCIN in the VCORE field.
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post #24 of 29
Thread Starter 
Quote:
Originally Posted by B!0HaZard View Post

No, you're not.

It's not much more. 0.018 is not a lot... Was it set to 1.18 V in the BIOS? If so everything looks excellent. Personally, I would keep my System Agent at 0.925 V, but if it's just set to auto that'll be fine too.

Also, funny that HWMonitor is showing the VCCIN in the VCORE field.

Yeah, for 4.6ghz it's set as 1.18 in BIOS. Even in my BIOS on the main page is states the CPU Voltage is 1.182 or something...

I just find it odd that a lot of threads I've read elsewhere have people citing CPU-Z Core Voltage as their voltage for their CPU but it's something else entirely.
And I'm tired.
I'll give those links a read tommorow, thanks to both of you for your patience.
post #25 of 29
Anything from before 2012-2013 will have used CPU-Z because it actually showed the correct voltage. I know Sandy Bridge still had Vcore readings in CPU-Z. I think the change happened with Haswell.
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post #26 of 29
Quote:
Originally Posted by B!0HaZard View Post

Anything from before 2012-2013 will have used CPU-Z because it actually showed the correct voltage. I know Sandy Bridge still had Vcore readings in CPU-Z. I think the change happened with Haswell.

Why would they decide to use VID anyway?

VCore is the actual core voltage, as measured by a voltmeter in the core... It doesn't get more accurate than that.
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post #27 of 29
Deleted as I was wrong
Edited by MikeDavo - 10/27/15 at 12:54am
post #28 of 29
Quote:
Originally Posted by MikeDavo View Post

Manual will not drop your Vcore voltage under any circumstances.

I agree that Manual will not drop volts.
Quote:
C states and speedstep will not help here,

Enabling the C States will definitely help.



Intel CPUs use power gating where various parts of the core can be rapidly turned on and off. When a Haswell CPU is idle, individual cores should be spending 99% of the time in the C7 C State. In this state, the core is disconnected from the voltage rail and is being fed virtually zero volts. When a core has a task to perform, it will almost instantly go back into the C0 C State and receive full voltage but as soon as the core has nothing to do, it transitions back into C7 for a significant power savings. Average voltage going to the CPU cores is going to be significantly less if the cores are getting zero volts 99% of the time when idle. Even when not idle, Core i7 CPUs are overkill for many tasks and individual cores and threads will be mostly idle. The cores might as well be sitting in C7. Disabling the C States is kind of like leaving all the lights on in your house 24 hours a day, even when you are not home. Kind of pointless.

I am a fan of the Core C States. I find they work great and your CPU can be 100% stable when they are enabled, even when overclocking. I prefer to disable the Package C States. I found that the Package C States can cause light load BSOD issues.
post #29 of 29
Yes
Edited by MikeDavo - 10/27/15 at 12:55am
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