I confused as to which type of RAM is better for a gaming rig.
If you have an APU, the faster the better!
It depends on if your cpu can handle 2133 mhz of ram. Most of the time 1600 mhz is good enough for gaming.
1600MHz is kind of the sweet spot right now for gaming. As nightwishkid said, if you have an APU like the AMD Trinity chip class then you'll want faster RAM to handle the data throughput better to achieve a higher FPS. Keep in mind that some budget motherboards don't even support higher frequency RAM without overclocking so check the specifications.
1600 will be perfect even for a hard core gamer, and often times they can be overclocked.
not experienced this, but from what I've read, it will also depend on what processor you plan on having. If you are planning on the 3570k, which most gamers do, going 2133 will serve no benefit because of the way Intel uses memory. However, if you are getting an AMD chip, 2133 will be much more recommended.
only APUs can use fast ram properly. anything else is going to be a waste
if you are using a mobo with an onboard video...the higher the better. to a certain point, the extra ram will be allocated to the onboard video...
The higher mhz, the more unstable the the computer. I would recommend not going higher then 1866 mhz.
I mentioned in another thread that there is quite a few opinions on the subject but I ultimately based my decision off of this great article
Although it is worth noting that performance issues can arise with higher clocks.