you have the enable LSI and then boot from LSI.
more fun.. my nice expensive 1866 corsair dominator-gt memory didnt work. 4 eight gig sticks all failed extensive memtest one stick at a time in multiple slots to verify.
bought some cheap 4 gig sticks 1600 to test and they work. so rma'd the memory back to newegg and ordered some cheaper 1600 sticks for 32 gigs.
i THINK the problem may have been my CPU didnt support the mem speed.
i also had to rma my first mboard. dead on arrival. would not even start to cycle (not a mem issue). second one works fine (with the 1600 mem). been building systems for 20 years or so and each new build (all more or less high end workstations) gets harder to get all the parts, software, bios and add in cards to work....