The technical answer is, "yes", you can, as both pairs are compatible with the DDR3 DIMM slots. Mixing RAM; however, can sometimes lead to stability problems. The problem is because you can't specify settings to apply to individual DIMM slots. Meaning, the RAM/DIMM settings in the BIOS/UEFI apply to all slots.
What this means is if the specs differ from pair to pair, your mobo will need to run at the:
- Higher voltage between the pairs
-The looser timing/latency between the pairs
- The lower frequency between the pairs
While both pairs are capable of performing at 1866, you must also consider the voltage and timing that each pair needs to be set at in order to run at the 1866 frequency. In other words, if the Vengeance pair requires 1.5V to run at 1866, but the Dominator require 1.6V, you'll have to set the DIMMs to operate at 1.5V or risk overvolting your Vengeance pair. Conversely, setting the DIMMs to 1.5V may cause your Dominator pair to run poorer than you'd hoped because it's not getting the voltage requirement.
This is why it is best to buy one complete kit. Installing and running both kits won't kill your mobo, but you may find that you're going to have to run at lower performing modules. If you're going to try it, I recommend you start with returning your BIOS/UEFI to default values. Then check your RAM/DIMM settings. If not already on "[Auto]", change it. From this point, do some stability tests. If you start crashing, adjust the RAM settings to the lowest common setting between the two pairs, and then test some more.
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