I bet a lot of people that get the ASRock X58 get the cheapest OCZ memory to go with it since they have to get 50% more memory and it's about 50% more expensive than a good P55. I know that tested DIMM compatibility lists are very incomplete, but when I am sure about the MB earlier in purchasing than the RAM, I check the list and see if I can find a good set on there that I can find available for good value.