Bollocks.. mine have black pcb's too & they are running @ 1000MHz 7-8-7-21 T1 with 1.63V since March..
So either they're faulty, or you need to give them a little more vQPI/vVTT. Mine need 1.45V on both Rampage II Extreme & EVGA Classified 760, regardless what CPU..
Edit: Just swap them. You got lifelong warranty.






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