Whether or not anything faster than 1600 makes any difference for you depends on what you use your system for.
In most every day uses and gaming, there's almost literally no difference, but if you do a lot of memory intensive work, use a RAM disk, or you're using the iGPU of the 3770K instead of a dedicated GPU, there's a moderate difference, but you would need to go up to at least 2133 to see it. Really, 2400 and above is where it starts to make enough of a difference to be meaningful, though.
And no, overclocking doesn't change anything.
As far as the Ripjaws X only being compatible with Sandy Bridge, that's pure and total BS. It'll work just fine with an Ivy CPU.