Intel's Skylake loves high-speed DDR4. G.Skill loves making it. The G.Skill F4-3866C18D-8GTZ is one of those high-speed kits, topping out at a crazy 3866 MHz, a whole 1733 MHz above the Skylake base memory specification. Can our CPU make it that high? Does your motherboard even support such speeds? G.Skill's 3866 MHz TridentZ kit definitely pushes the limits.