Is the ASRock X99 Extreme4 (http://www.newegg.com/Product/Product.aspx?Item=N82E16813157543) compatible with G.Skill Ripjaws 4 seried ddr4 3000 mhz memory (http://www.newegg.com/Product/Product.aspx?Item=N82E16820231873&cm_re=G.skill_4_series_16gb-_-20-231-873-_-Product). The motherboard says it will work with 3000 mhz but it has OC in parentheses next to it, What does this mean. Will I be okay? Thanks for any help!