Osterman, have you tried 4.0ghz by using 500 fsb x 8? Also, why is your command rate at 1...set it to 2. That should solve your ram headaches! Might also let you get your PL (Static tRead) down to 8. That with ram at 1:1 for 1000 mhz should do you much better at 4.0ghz. Just a thought. Nice OC! and good luck!