Did you just install the CPU?
Update your post to include full system hardware specs and OS information.
What motherboard are you using?
The motherboard's documentation (User Guide/Manual) should list the supported CPU's. And likely includes a reference to the manufacturer's website for more up-to-date information. Check the QVL (Qualified Vendors List).
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CPU-Z could be wrong.
Check CPU using "WIN" + "I" > System > About
Or open Powershell as admin and enter "systeminfo" at the PS> prompt.