The latest bios for X99 Extreme 4 and Windows 10 x64 1809 release does not support overclocking on 6900k intel CPU. Please update the Intel microcode in the bios files. Thanks.
More here: Windows 10 KB4100347 update breaks Broadwell-E overclocking - CPU - News - HEXUS.net
Other manufacturers like ASUS and MSI already have bioses out that fix this issue...
More here: Windows 10 KB4100347 update breaks Broadwell-E overclocking - CPU - News - HEXUS.net
Other manufacturers like ASUS and MSI already have bioses out that fix this issue...
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