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I just changed my case and motherboard (from a Asus MAXIMUS VII HERO to a MAXIMUS VII IMPACT), and after a clean reinstall of Windows 10 (which I was running before), the CPU is locked at 8x multiplier so it only runs at 800 Mhz (it is a 4690k). I've run mutliple stress tests, and the CPU goes to 100% but at 800Mhz.
I've reset CMOS, BIOS settings, tried downgrading the BIOS to older versions, but nothing gives at this point and I am ready to give up.
Full system specs:
4690k + Corsair H100i GTX
16GB 1866Mhz Corsair Dominator
Asus MAXIMUS VII IMPACT
Crucial 256GB SSD
WD Blue 1TB