The bios is updated… It was the first thing I did ;).
Well… the system is stable with mem frecuency set to 5333MHz. The stress mem test is ok… no fail. If i rise the frecuency more than that, i get a fail test. So this must the reason becouse i had CTDs in msfs.
So… If i have some CTD now, the problem is from msfs, no my fault… I suppose… 