Hey, so i recently bought 16 gb Corsair vengeance lpx 2666mhz ddr4 (2x8gb) to upgrade from my generic lenovo 8gb ddr4 2666mhz and the old ram ran at 2666mhz but when i put in the new sticks it defaulted to 2133mhz and i cant change it in the BIOS :/ there isnt even an option...but i know that the old ram ran at 2666mhz so ? iam confused...PLS help