For my new machine I used an 8Gb kit of DDR3 G.Skill Ripjaws at 2133Mhz.
When I look at the speed of the RAM in the BIOS however it says the speeds are at 1600Mhz.
Is something wrong? What should I do?
Depending on your machine, you may have to manually set the RAM speed in the BIOS itself. Else, it will run at default (not necessarily the rated speed of the RAM).