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Skylake Overclocking Guide [With Statistics] - Page 860

post #8591 of 11372
Quote:
Originally Posted by abso View Post

Today I noticed I get different Vcore Voltages, depending on which Prim95 I'm using. With Version 26.6 VCore is lower compared to later Versions. This only happens if VCore ist set with Adaptive or Offset mode. With Manual Mode VCore is the same on all Versions. Anyone noticed this before and mb knows why this happens? CPU load ofc is 100% always.
That's because with adaptive and offset LLC is kind of dependant on load. Newer prime95 loads down cpu much harder then 26.6 because of avx. 100% load is not the same depending on program. That's why temps are different depending. This is why I use manual mode to find stability at a certain voltage then I change to offset or adaptive and I set my LLC to where during light load but max clocks I get slightly higher voltage then when under stress test load. For example 1.35 while gaming but 1.32 during stress tests (1.32 is what would be set in manual mode). Unfortunately I can't do this on my skylake cpu because my msi board only has 1 LLC setting n with offset or adaptive it rises slightly under load. No big deal tho I can still do the same thing but I'm just leaving manual since if my rig is on in gaming and if I'm not gaming it's off. So power saving modes don't really benefit me.
Edited by HOODedDutchman - 8/23/16 at 1:42am
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post #8592 of 11372
I looked a bit more into this topic and found this.

In Post 6 some Asus guy explains the different modes to set VCore.

Quote:
There is one issue with Offset and Adaptive Mode that needs to be taken into account. The processor contains a power control unit which requests voltage based upon software load. When the PCU detects AVX instructions, it will ramp Vcore automatically beyond normal load voltage. There is no way to lock Vcore to prevent this if using Offset or Adapative Mode. This is pre-programmed by Intel into the PCU.

As an example, a CPU is perfectly stable at 1.25V using a manual voltage (static), if Adaptive or Offset Mode is used instead, it is impossible to lock the core voltage when running software that contains AVX instruction sets – stress tests such as AIDA and Prime contain AVX instruction sets. When the AVX instructions are detected by the PCU, the core voltage will be ramped an additional ~0.1V over your target voltage – so 1.25V will become ~1.35V under AVX load. If you intend to run heavy load AVX software, we recommend using Manual Vcore, NOT Adaptive or Offset Mode.

So the way I understand this is, as soon as usage of AVX is detected it doesnt matter anymore what Vcore you set in adaptive mode and CPU will just use higher Voltage. So this means you can use lower voltage and be stable with adaptive mode compared to manual mode? In daily usage you can run lower voltages on 100% load as long as there is no AVX involved. And if AVX is involved CPU will just take Voltage it needs. On manual you always have to set voltage higher because it wont change if AVX is used.
Edited by abso - 8/23/16 at 2:16am
post #8593 of 11372
Quote:
Originally Posted by abso View Post

I looked a bit more into this topic and found this.

In Post 6 some Asus guy explains the different modes to set VCore.
So the way I understand this is, as soon as usage of AVX is detected it doesnt matter anymore what Vcore you set in adaptive mode and CPU will just use higher Voltage. So this means you can use lower voltage and be stable with adaptive mode compared to manual mode? In daily usage you can run lower voltages on 100% load as long as there is no AVX involved. And if AVX is involved CPU will just take Voltage it needs. On manual you always have to set voltage higher because it wont change if AVX is used.
X264 16T & RealBench uses AVX but I do not see any added voltage to vcore when I tested Offset mode.
XTU uses AVX2 and it added 0.05-0.100v to vcore when I was testing with Offset mode. No added voltage with Adaptive mode (with manual offset voltage; I did not try Auto offset voltage)
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post #8594 of 11372
I only tried different prime95 Versions and with V26.6 i have Vcore 1.232V and >V26.6 i have 1.280V when i use adaptive mode. (6700K@4.4Ghz / Asus Z170 Pro Gaming)

So CPU pretty much always runs at 1.232V under 100% load in daily use. If I wanted to use manual mode for example I had to always have 1.280V set because it wouldnt increase voltage if AVX is used which resulted in BSOD.
Edited by abso - 8/23/16 at 2:34am
post #8595 of 11372
Quote:
Originally Posted by abso View Post

I only tried different prime95 Versions and with V26.6 i have Vcore 1.232V and >V26.6 i have 1.280V when i use adaptive mode. (6700K@4.4Ghz / Asus Z170 Pro Gaming)
You are using Adaptive mode with auto or manual offset voltage? If you are using auto, it would explain why I don't see a vcore increase with AVX2 while you do.
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post #8596 of 11372
No extra vcore added for me using Adaptive mode on my Asus z710 gaming pro.
But only tested Realbench and Aida64.
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post #8597 of 11372
In adaptive mode my offset is on Auto. I just run Cinebench and CPU-Z stresstest and Vcore is 1.232V there as well.
post #8598 of 11372
Quote:
Originally Posted by abso View Post

In adaptive mode my offset is on Auto. I just run Cinebench and CPU-Z stresstest and Vcore is 1.232V there as well.
Actually adaptive mode with auto offset voltage as you are using now sounds good. Seems to add voltage accordingly with load, as long as vcore doesn't shoot up to too high a value with AVX2 - then seems OK smile.gif
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post #8599 of 11372
In bios i have set Adaptive mode, Turbo Vcore 1.240V, Offset Auto. Max. VCore i had was 1.280V and that only happens with Prime95 >V26.6 or I guess other Software that is using AVX instructions. Prime is just the only one I know of. Everything else runs at 1.232V which is good enough for me.
post #8600 of 11372
I'm pretty sure it only does it with offset guys. Probably why the mobo manufacturers added adaptive into the mix.
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