Hi guys I am currently using a hyperx fury 1x8gb 1866mhz DDR3(the blue one) and i am planning to upgrade my ram to 16gb.Will i go for another 8gb 1866mhz ddr3 blue memory module or should i buy the one with much higher clock speed? like 2133mhz (i am using MSI H81m-p33 mobo and i5-4460 for my processor) thank you for your suggestions