Calvin7 said: Standard memory speed for the AMD A8-5600K is 1866MHz according to CPU-world.com. Higher frequencies are commonly used when overclocking DDR3 2400(OC)/2133(OC). .
Kenway said: http://www.overclockers.com/asrock-fm2a85x-extreme6-motherboard-reviewcheck this link it shows the OC versions available for A85X motherboard. you cant OC 1866 whereas OC for 2600/2400/2133 are available.