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Beginner
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My new 9900k will not start into Windows on 8 cores, the 9600k in that board worked fine. If I only enable 6 cores on the 9900k it starts fine. even with 7 it freezes during startup. Getting into BIOS is not problem. Latest BIOS is installed

 
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Super User
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Windows 7 is not supported. Only windows 10 is supported on 7th gen and later processors.

 

Have you updated the bios on your motherboard?

 

Doc

 

Doc (not an Intel employee or contractor)
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Beginner
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Hello,

yes, its the latest BIOS and I run win10 pro 64 bit

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Super User
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Are you certain your motherboard and bios supports the 9900K? What is the motherboard model number?

 

Doc

Doc (not an Intel employee or contractor)
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Beginner
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Yes, it's the AORUS Z390 I pro wifi

 

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Super User
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Well, either gigabyte support or one of the Intel support engineers will have to assist you.

 

Doc

 

Doc (not an Intel employee or contractor)
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Beginner
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I will get another Z390 board in the next days, will check and confirm the CPU or the board is the issue ( But I tend to believe its the CPU, it was starting once with 8 cores, then crashed in Windows and never started again on all cores

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Super User Retired Employee
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Have you tried reinstalling Windows?

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