So you have dual channel correctly running, the RAM is at 1333Mhz (but that wont cause crap performance) this can be fixed by setting XMP in the BIOS to get the RAM upto the correct speed (if the memory controller in the CPU can handle 2400Mhz? it may prefer 2133Mhz).
If you also download Prime95 and run that does the reported core speed (showing at 1.4Ghz because of power saving) jump upto the correct speed?
If you also download Prime95 and run that does the reported core speed (showing at 1.4Ghz because of power saving) jump upto the correct speed?