1866 DDR3 memory should operate at 933Mhz, so that isn't right.
Doesn't seem to conform to any other normal speed either. Make sure the software is compatible with your system to provide adequate information. CPU-Z would be an alternative to check with.
If you've been overclocking or otherwise changing the settings, simpler to go into the BIOS and check though. There you can set the memory speeds manually or use a memory profile.