Does the colour of the RAM colour matter and what do numbers like this mean in RAM 11-11-11-27
And why is the 2133 RAM cheaper that the 1866 ram
http://www.ebuyer.com/521865-corsair-vengeance-pro-8gb-2-x-4gb-memory-kit-pc3-15000-1866mhz-ddr3-cmy8gx3m2a1866c9r
http://www.ebuyer.com/370075-corsair-vengeance-8gb-2133mhz-ddr3-red-heatspreader-cmz8gx3m2a2133c11r
And why is the 2133 RAM cheaper that the 1866 ram
http://www.ebuyer.com/521865-corsair-vengeance-pro-8gb-2-x-4gb-memory-kit-pc3-15000-1866mhz-ddr3-cmy8gx3m2a1866c9r
http://www.ebuyer.com/370075-corsair-vengeance-8gb-2133mhz-ddr3-red-heatspreader-cmz8gx3m2a2133c11r