Which memory is your?
Lower command rate is faster, however each memory kit/stick has its own timing. Since 1999 memories modules come with serial presence detect (SPD), which is the way CPU-z and other software automatically detect the memory timing.
If CPU-z says your command rate is 2, then it is very likely it is in fact 2, but you can tweak it manually through Bios, but your system can get unstable, and get crashes if you do not know what you are doing.
If your memory kit has XMP profile, then you can set it to XMP in the Bios for higher-performance memory timings, tough I am quite sure the command rate will remain 2.