i received some Ballistix Tactical Tracer in the mail today (4GBx2x2) and i can't get them to run at their profile speed with X.M.P. i started selecting in small increments and each one posted @ 1600, 1800, but as soon as i select 1866 with all the timings and voltage automatically applied, it wont post and will continue to turn on and off before i have to reset the memory again. clearing CMOS and redoing steps changed nothing. RAM is compatible according to Crucial's website.