Why cpu-z or another programs show me just 4 core. Did i miss something? What should i do?
Core limiter disabled in msconfig?
If Windows and BIOS is showing the correct number, then it's just a detection error in CPUz.
AMD Ryzen™ Threadripper™ for gaming
"Introducing Game Mode
Making a hugely multi-core CPU that’s ready for gaming is a challenging effort, because most PC games are designed for the typical 4-8 core processor. When greater core counts enter the picture, things can get squirrelly: poor thread scheduling can reduce performance, or (more rarely) the game may simply not run at all. The Threadripper team at AMD spent a long time thinking about how we can help our customers avoid these scenarios altogether, and we call it Game Mode.
Game Mode is a new feature in AMD Ryzen™ Master that reconfigures the platform in two key ways:
Make sure you have Game Mode Disabled in AMD Ryzen™ Master since it disables 8 cores to improve on gaming performance.
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