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Kaby Lake Overclocking Guide [With Statistics] - Page 172

post #1711 of 2783
Quote:
Originally Posted by Inelastic View Post

I found that I can lower my temps by keeping a lower LLC. My cpu runs at 4.8GHz with Vcore set at 1.21V in the bios. Under load, it runs at 1.65V with LLC 3. If I raise the LLC up to 5 so the Vcore is at 1.21V under load, then the core temps raise up by ~4C. If I try to lower the Vcore in the bios below 1.21V, the cpu becomes unstable.
yes, with your ASUS board, a lower number LLC is less compensation = more droop (asrock is opposite). for all but really extreme overclocking, allowing a healthy amount of vdroop is beneficial for the cpu. thumb.gif
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post #1712 of 2783
Quote:
Originally Posted by wingman99 View Post

Thanks for doing that test.smile.gif My VID is much higher on my i5 VID=1.283v Vcore=1.260v Max, running Prime 95 at 4.2GHz optimized default settings except multiplier.

You're welcome! Keep in mind that I've let Prime95 v26.6 run only about 5-10 minutes, and checked with other settings only for about 1 minute but VID was the same. No idea if it would have changed later on, probably not. Also v26.6 is an old version, with newer ones that use AVX instructions my temps reach 90-95 degrees pretty much instantly so I don't use those. Maybe when I'll get myself a beefier cooler (hopefully soon, maybe next week) I'll do some more tests.
    
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post #1713 of 2783
Quote:
Originally Posted by dirtyred View Post

You're welcome! Keep in mind that I've let Prime95 v26.6 run only about 5-10 minutes, and checked with other settings only for about 1 minute but VID was the same. No idea if it would have changed later on, probably not. Also v26.6 is an old version, with newer ones that use AVX instructions my temps reach 90-95 degrees pretty much instantly so I don't use those. Maybe when I'll get myself a beefier cooler (hopefully soon, maybe next week) I'll do some more tests.
It is very interesting that you have such a low VID. I just did a test at 4.2GHz, with Prime95 v28.10 AVX off command (CpuSupportsAVX=0) and maximum VID = 1.238v. With AVX command that I added removed from local.txt running Prime95 v28.10, it was maximum VID=1.283v. I did each test for 5 minutes. If you get a new cooler and do more tests PM me.
post #1714 of 2783
Quote:
Originally Posted by dirtyred View Post

LLC is to compensate Vdroop. High levels result in Vboost. You have to find the sweet spot. Higher is not always better.
Don't know but considering that on average is around 1.2 V and lower on default, while some use 1.4 V to achieve 5 GHz overclock, stock clock speed and 1.4 V seems really high.

Apparently the EVGA boards don't have LLC on them or any of the other settings for that matter that you recommended. Just voltage changes, multiplier, C-States, etc.
post #1715 of 2783
Okay, luckily after my delid the CPU still works I just booted into Windows and my temps were looking fantastic exactly at water temperature. So I fired up ROG realbench and the temps literally shot through the roof higher than before the delid. I was curious does liquid metal take awhile to settle? or have I potentially not put enough on? I really tried to put as little as possible on as I didn't want to risk it spilling over, could this possibly be the issue?
post #1716 of 2783
Quote:
Originally Posted by Zacw View Post

Okay, luckily after my delid the CPU still works I just booted into Windows and my temps were looking fantastic exactly at water temperature. So I fired up ROG realbench and the temps literally shot through the roof higher than before the delid. I was curious does liquid metal take awhile to settle? or have I potentially not put enough on? I really tried to put as little as possible on as I didn't want to risk it spilling over, could this possibly be the issue?

You need to spread the liquid metal in the die and in the IHS. A small drop in each one, then spread nicely. There are very good youtube videos showing how to do it the right way.
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post #1717 of 2783
Quote:
Originally Posted by Vommok View Post

You need to spread the liquid metal in the die and in the IHS. A small drop in each one, then spread nicely. There are very good youtube videos showing how to do it the right way.

Yeah I watched a couple videos but in my past experience I accidentally put to much on which went everywhere and was a mess to cleanup.

Anyway I just took the loop apart and applied a bit more liquid metal.


Running Rog real bench for an hour @ 5ghz OC @ 1.35 Volts max temp is now 61 previous temp = over 100 in about 2 minutes.


Thats over a 40 degree drop in temperatures! that's absolutely insane!
post #1718 of 2783
That must be a new world record. I don't recall reading anyone experiencing more than 25C temp drop on Kabylake.
post #1719 of 2783
Quote:
Originally Posted by wingman99 View Post

It is very interesting that you have such a low VID. I just did a test at 4.2GHz, with Prime95 v28.10 AVX off command (CpuSupportsAVX=0) and maximum VID = 1.238v. With AVX command that I added removed from local.txt running Prime95 v28.10, it was maximum VID=1.283v. I did each test for 5 minutes. If you get a new cooler and do more tests PM me.

Did the test again just because I was curious. For default clock speeds my current cooler is enough. Did reset HWiNFO value when Prime95 was running for about 2 minutes and let it run a couple minutes to get a better average.

Prime95 v28.1 with AVX support enabled and emptied local.txt ran at 4.1 GHz and VID 1.130 V using Blend on 8 threads:



Same but with CpuSupportsAVX=0 added to local.txt:



The content of local.tx (only CpuSupportsAVX=0 was added/removed):
Quote:
CpuSupportsAVX=0
OldCpuSpeed=4200
NewCpuSpeedCount=0
NewCpuSpeed=0
RollingAverage=1000
RollingAverageIsFromV27=1
ComputerGUID=744911083ed2442f3ed593315fb3839d

Just as previously, it seems that the number of threads and FPU size (8k, 128k, 448k, 1024k, 1344k) or has absolutely no influence on VID.
    
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post #1720 of 2783
I am totally floored by this, even at the voltage that I set it STILL restarts on it's own. The only other thing I can think of is the xmp profile is pushing the memory voltage too high?
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