DarkDubzs,
Did you get the RAM configured properly at DDR3-1866? All DDR3 RAM defaults to standard values of DDR3-1333 or DDR3-1600, then anything higher needs to be enabled/configured by the user. Once you manually input settings, or enable the XMP/DOCP/EOCP performance profile, the motherboard will know high speed RAM is being used. The reason for all this is so the RAM can be used in any DDR3 motherboard, whether it can support the higher speed or not.
To enable dual channel, maximum performance, you will need another module. This does NOT mean the RAM will run at DDR3-933 instead of DDR3-1866. Depending on what program you use to check DRAM frequency, some will show real frequency, some will show effective frequency.
DDR3-1866 is the effective frequency, and notice not mentioned with "MHz". The real frequency of DDR3-1866 is half the number, 933MHz.
933MHz is the bus frequency of the RAM, because of DDR (double data rate) technology, this value can be doubled to have an effective transfer rate of DDR3-1866. The number value is doubled, but it is no longer "MHz", it is MT/s.
DDR3-1866 MT/s is 933MHz
This is commonly confused information, but hopefully it is more clear now.
Thank you
GSKILL SUPPORT