different frequency ram is used

Hi all, I have 2 different sets of RAMs from different manufacturers and having different clock speeds: - (2 x 4 GB) G.SKILL Ripjaws X Series 8GB 240-Pin DDR3 SDRAM DDR3 2133 MHz (F3-17000CL11D-8GBXL) - (2 x 8 GB) Kingston HyperX Fury White 16GB 1866 MHz DDR3 Ram (HX318C10FWK2/16) Is it...

Hi, there's a problem arises after 1 year and almost 6 months, that is my 4GB Ram is not working. I know the problem, which is I was using 1600mhz ram on my i5-second generation laptop. Two rams were attached, first is 2gb 1333mhz and second is that 4gb 1600mhz. But can anyone tell me why it...