There are two available ways to set up the memory speed. If manually setting the Memory Clock, you should also manually set the DRAM Timings and DRAM Voltage to the memory manufacturers recommended settings.
DRAM E.O.C.P
Allows you to determine whether to use the preset memory overclocking profile to achieve optimum overclocking performance. (Default: Disabled)
Set Memory Clock
Determines whether to manually set the memory clock. Auto lets BIOS automatically set the memory clock as required. Manual allows the memory clock control item below to be configurable. (Default: Auto)
Memory Clock
This option is configurable only when Set Memory Clock is set to Manual. The adjustable range is dependent on the CPU being installed.
X6.66 is 1333MHz
X9.33 is 1866MHz