ASRock > Products > Z68 Extreme3 Gen3 > Memory Support List
Well the particular RAM you're looking at isn't on the memory support list but the 1866 version of it is, so I'm willing to say that the RAM will work.
Don't exceed the voltage that is specified on your RAM and you will be fine when it comes to longevity. It's when people set ridiculous voltages when stuff starts to break.
For booting, just install the RAM, then check CPU-Z to see if the RAM is working at the speed that you want. (sometimes the motherboard can detect the XMP profile and load up automatically)
If the RAM is running at a lower speed (usually DDR1600/800MHz or DDR1333/667MHz), then you have to set the higher speed manually in BIOS.