Not really. Ram speed is the least important metric to improve game performance. Its waaaay down the list on things I would upgrade.
16 won't help much, unless u have a phobia from futureproofing! but it wont. that ripjaws x won't help either(for now). you can buy a corsair xms3 or a set of ripjaws of1666mhz. THE TRUTH: even the ripjaws X model u wer saying abt...it works at stock speed of 1666mhz. "i have a pair". 8 gb is enuff. those classy looking heat spreaders don't work magic unless you have one side of your case open! she looks beautiful BTW. if u believe your ram sticks r gonna stay fit for that long. GET THEM. ITS USELESS if not!
i gave you enough options to look out for boy.
If strictly gaming 1600/9 is sufficient, the faster DRAM is most useful when using the rig - like in rendering, imaging, CAD, multitasking, VMs, etc
I read an article which said over 1600 has little benefit. I just got 2133 because they were $5 more, but with a 4.4GHz o/c on my CPU, I actually run them at 1600 with tighter timing (it was more stable that way) and I get similar Maxmem scores as at 2400 with looser timing.
Anything over 1600 mhz would not make a noticeable difference