Asus rampage 3 extreme and Corsair triple channel dominator 1600

Welcome Newcomer!  

Always, side and trust & believe the Mfg's site over any reseller's site!

RAM spec: 6 x DIMM, Max. 24 GB, DDR3 2200(O.C.)/2133(O.C.)/2000(O.C.)/1800(O.C.)/1600/1333/1066 Non-ECC,Un-buffered Memory

When buying memory first check the Certified DDR {QVL}Memory Support list - http://usa.asus.com/product.aspx?P_ID=jy0uafxYBCrJwksC

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In addition, if none of the Certified DDR suits your needs then go to the RAM Mfg's site for Tested DDR. Compatible DDR vs "guessing" is a Best Patrice suggestion.
Corsair example - http://www.corsair.com/configurator/product_results.asp...

It's compatible but you do have to OC the memory controller to get the memory to run at 1600.