Why is my CPU running at max boost speed across all cores?
Stock 4690k is boosting to 3.9 across all cores. That's not how Intel Turbo Boost 2.0 works; this would be overclock to 3.9 GHz. this might explain whats going on https://i.snag.gy/MhYKRp.jpg
According to Wikipedia speeds bins for 4690k are 2/3/4/4. So turbo speed should be 3.7GHz, 3.8GHz, 3.9GHz, 3.9GHz.
I did recently overclock the CPU but I restored all setting to default. I think the restore default button might not have restored all settings.
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Some motherboards have a feature that runs all cores at the single core boost speed. That would be my guess at what's happening here. If you want to turn it off, the setting should be in the BIOS/UEFI.
MSI calls such a setting in the BIOS as "Enhanced Turbo" mode.
Asus calls it mce, multi core enhancement, some are on by default when it detects a k cpu, so when you reset bios. It’s turned on.