*TL;DR Warning: This is a long post and I wanted to provide as much info as possible, showing exactly what steps I took and what the results have been along the way. I think one has to enjoy small details and an analytical style for it, so I understand that not everyone has the time and/or desire to read it through. Additionally, maybe another new overclocker might find some information from my process that can help them. If you do not want to read it, you can skip down to Enter OCCT 5.5.1 Linpack 2019, which is where I am at now.
Currently at 5GHz 1.335v BIOS, High LLC, 45 Uncore, 1.20v VCCIO/SA, 0 AVX offset. Stable at everything I have thrown at it, except OCCT v5.5.1 Linpack 2019. There is not much info out there about people using Linpack for stability testing. It seems that most do not use it and I can understand why. Essentially, for what I do (gaming, browsing, light video and photo editing) I do not need to overclock. I am doing it to learn and do now, and when I upgrade my GPU next fall, then it will come into play more. And, of course, the tweaking and perfecting has become a bit addicting...just like tinkering with the build itself.
I have been building my own PC's for six years or so. Additionally, I have done GPU overclocking for four years, and am comfortable with it. However, CPU overclocking is brand new to me. Sure, I have read about it and done some research on the basics over the years, but this time I am going all in. Right now, I am a little over two weeks into it, with the vast majority of that time being spent reading, researching, re-reading, and learning. I did not simply want to change voltages and settings, I wanted to know what they did, why I was changing them, and what effects occurred. My current knowledge level is that I am comfortable with using manual vcore set in bios along with vcore load line calibration and what occurs using them; ie: vdroop, vrout vs. vcore, etc. A big thanks to
, and many more people here and on other sites. Without all of you and your experience, I would never have known what I do now.
Current rig and full parts list can be found here
Current BIOS settings Gallery
Current 5.0GHz HWinfo64 readings
from yesterday showing 15hr spread. No gaming nor stress testing was done. Ambient room temp at time of pic was 77F (25C), fans kept at 60%, pump at 50% all day and night. *Note--room is on the upper floor and certain people just need to crank up the furnace, so can get quite warm. Normally, I keep the window cracked a little, but just let it be to give me an idea of what temps will be in summer when it is 95F (35C) outside.
Stock 4.7GHz MCE HWinfo64 readings
for comparison. It seems that some Gigabyte boards come with MCE on for the 4.7GHz all boost. Only changes I made were to vccio.sa to lower them, and disabling onboard sound/graphics/VT-d. I keep this as a saved profile for reference now.
9900k is neither lapped nor delidded. I did a simple spin test by flipping it onto the IHS on a piece of glass and see if spun like a top. It did not spin one bit, and upon closer inspection with a straight edge (razor blade), I confirmed that thing is flat. TiM is MasterGel Maker Nano. Prior build was Hydronaut, and before that I used Pk-3.
Testing used to reach stability:
*Testing Note -- When I first started attempting to overclock, I did not think about the vccio and vccsa that XMP applied. It set them to 1.254 and 1.296 respectively. Consequently, at first I did not touch them. Reading some of the guides, they mention them, but not just how important they can be, or they effects they can have. Consequently, as I tested and got errors, I would go in and bump the vcore. What I found was that my system would get more and more unstable (windows would close themselves and other odd behavior) as I increased vcore. The opposite of what I expected to happen. At 1.295 vcore, I stopped and dug more into it. When I lowered vccio/sa to 1.150v, I was more stable at a lower vcore and able to start again from 1.265v BIOS.
The Initial Result: *Note-- All below info is using High LLC (vcore loadline calibration bios) AVX offset=0, 1.200 vccio/sa.
At 1.330v BIOS 45 Uncore, I seemed to have a highly stable overclock (woohoo!), so I started to work on upping the Uncore. I bumped it to 46 and ran a few quick stress tests. Then, I loaded OCCT 5.5.1, begged it to be kind, and ran the OCCT HT enabled AVX2 Large Data Set ). Ran it for a couple hours (pics one
, and three
), with no occt errors or whea errors. It was 2am at this point, so stopped for the night. Sorry for the camera pics; I was beat and there was no way I was going near that keyboard and accidentally ending the test.
The next day I ran another: Blender Benchmark Full
, 3600sec loop of Cinebench r20
, and two hours of Realbench 2.56
. All passed fine again with no errors.
Enter OCCT 5.5.1 Linpack 2019:
Throughout my learning process, I saw bits and pieces about Linpack testing with overclocks, but compared to everything else, there was not a whole lot. In any case, I had gotten this far and decided to give it a shot. Not knowing exactly how hard it would hit my system, I just used the recommended default settings and started it up. About 15 minutes in, no linpack errors, but HWInfo said "I laugh at your stability...here, have a Cache hierarchy error." Fuuuu--dge!!! I was so mad that I closed HWinfo64 and OCCT. A few more choice swear words later, I collected myself and went back to BIOS.
Bumped vcore to 1.335v with same 46 uncore. Rebooted and ran a 3600sec loop of Cinebench r20 and then a couple hours of Prime95 29.8 small fft no-avx (Temps
). No errors, so off to bed and dreams (nightmares?) of the Prime95 minions hammering away.
The next day it was time for more Linpack 2019. This time I got 35min in with no WHEA errors, but one error popped up in Linpack itself. Went back to BIOS and dropped the uncore to 45.
*Note--For testing here on out, I kept my window cracked as I normally do, which maintains an ambient of 75F +/-1F (24c). About 10 seconds or so after starting the tests, I would reset HWInfo64 to remove the idle values.
Rebooted and ran a full Blender benchmark to make sure no errors there. Loaded up OCCT 5.5.1 Linpack 2019 and away we go. Here
is a shot of it at the 44min mark. Hooray...doing great. At 52min in there were still no linpack errors, but HWinfo popped a WHEA error Cache L0. From what I learned, I think that is related to uncore, vccio/vccsa.
Tried 1.34v BIOS, 45 Uncore, Kept 1.2 VCCSA and dropped VCCIO to 1.190. At 18min into Linpack, got a WHEA correctable error.
Next tried 1.34v BIOS, 45 Uncore, and put vccio back to 1.20. Result was that it popped 1 Linpack error at 35min mark, but zero WHEA errors. This
is a shot of the 80A current pull and here
is where it can pull 180A.
Odd...I was more stable at 1.335v. So went back down to 1.335v and ran, yet another 7200sec loop Cinebench r20
, which went off without any errors again.
So, this is where I am at now. Prior to this point, I have been able to search on my own and find the answers to any questions that came up. But now, I am stuck, have had no luck finding the answers online, and am not sure what adjustments I should make. It seems that I may need to bump vccsa, but to what? 1.210? 1.250? And also, do I change uncore and raise it now? If so, do I leave vcore at 1.335 or push it up to 1.34 again? I feel I am close, yet not sure which to adjust and by what amount.
I know there are other Linpack programs out there, and I know I might be at the overkill stability test point, yet I am enjoying the ride and learning a ton. I am not looking to be NASA certified stable or anything; all I want to do is get an hour or so on this Linpack and I will be happy. But right now, it is like that one unchecked box on a list that gnaws at you. Not to mention, I happen to like my system very much and do not really want to kill it by constantly running high amps into it.
Thank you all in advance for your time and guidance.
*One final note-- If
reads this, could you please clarify that High on Gigabyte is 0.8 mohm and Turbo is 0.4 mohm. While I am pretty sure it was a mistype, in this post you say High is 0.4, yet here, and pretty much everywhere else, you say 0.8. Given that I am pulling 180A, I just want to double check and be sure about my voltages at that kind of current. Thanks!*