How do I change ram frequency on my Acer aspire tc 885

So recently I bought an aspire tc 885 desktop and I wanted to upgrade the ram cause I use it for gaming aswell, I bought 2x8gb ram sticks the frequency of the ram is 2666mhz but when I put them its telling my it's running at a lower speed 2111 I think it was I need help changing the frequency to the advertised amount.