i have manage to keep it stable at 9-8-9 -28 1.60v. and prime isnt showing any errors. so far.
Sorry about the late response. The default voltage for that RAM is 1.65V. I am not sure if this has been resolved yet but I run my 2400MHz RAM which are also 1.65V at 1.75V and it works without any issues. For some reason.. I like more voltage even though it is stable at 1.65V. I am a freak! Hope this helps!
Try running that 2133mhz G.Skill memory at 1333mhz with timings of 7,7,7,21 with a 2T command rate at 1.50v, if it will not run cas 7, try cas 8, at 8,8,8,24 or cas 9, at 9,9,9,24, for 1333mhz keep the 1.50v and 2T CR.
AMD never claimed the FX8350 would run memory speed of 2133mhz.
If you can run 1333mhz rock solid then you can increase from there to 1600mhz or further but don't start out past AMDs recommendations right out of the gate.