Method320I'm experiencing the exact same issue on my x99 FTW K an i7-6800k Multiplier of 42, has worked since I owned the thing, won't stay on when booted into windows. Bios shows 4.2 GHz, even task manager if I open it quick enough will say around 4.2 GHz, but then drops down and never goes above like 3.5 or so. Really need a fix for this.
HeavyHemi Same solution for you, update your BIOS.
Method320HeavyHemi Same solution for you, update your BIOS. Ah, I thought I was on the latest (2.06) because the stickied post says to use that. Ive just updated to 2.08, this _seemed_ to have solved my problem I think but not the way I wouldve expected. Before, my overclock was static. In that it never downclocked. 4.2 Ghz at all times, all the time. Now, when the cpu isn't doing much, it downclocks to like 1.5Ghz. This is probably a better scenario anyway.
HeavyHemiHave you folks updated your BIOS? Updating Windows will not fix this. You need to update your BIOS with the new ucode.Right here:
TrevelyasI'm still having the same problem as I described in the original post. HeavyHemiHave you folks updated your BIOS? Updating Windows will not fix this. You need to update your BIOS with the new ucode.Right here:Thanks for the reply. As stated in the original post I've tested several versions including 2.08 and have been on 2.08 ever since the tests. I flashed it again today after Win updates just to be sure. I've since updated to Win version 1909 and ran another Windows update this morning, so I'm current.With the feature update to 1903 ( or perhaps 1909), Windows installed a newer version of mcupdate_GenuineIntel.dll, dated 3/18/2019 and versioned 10.0.18362.1. Am I really the only person here with BIOS v2.08 who still can't keep the OC in Windows? For anyone else who has an OC'd 6800K:What microcode update does the BIOS say you have? Is it B000036?What version of Windows/System32/mcupdate_GenuineIntel.dll do you have?Do you recall having to uninstall KB4100347 or the like sometime around Sep/Oct 2018 to make your OC work? If so, did it fail again sometime later and then return once you updated your firmware to 2.08?Do you have a "Turbo Boost Max Technology 3.0" app that starts with Windows? Is it Enabled?In Device Manager -> System devices, do you have a "Intel(R) Turbo Boost Max Technology 3.0 Driver"? Is it dated 12/12/2017, version 126.96.36.1995? I'm just at a loss as to what could possibly be different between my system configuration and anyone else's that has an OC'd 6800K.
HeavyHemiWhat do you mean, tried different BIOS versions?
HeavyHemiAre you on BIOS 2.08 or not?
TrevelyasHeavyHemiWhat do you mean, tried different BIOS versions?The EVGA download center has several versions available:When I did my tests in November I tried versions 2.02 (the original my mobo shipped with) up thru 2.08. HeavyHemiAre you on BIOS 2.08 or not?Yes, I'm on version 2.08. I agree the evidence suggests it's an OS problem. That's why I'm asking about other people's microcode version, mcupdate_GenuineIntel.dll version, Turbo Boost Max driver version, etc.
HeavyHemiPlease update to Windows 10 1909. Thank you. I do not know why you're still on 1809. I just noticed you also had feature updates and fixes disabled.
HeavyHemiSo, either update or keep wasting your time.