Has anyone managed to get TRRD above 42 on P5B Deluxe or any other P965 board?

I'm having problems with 2x2GB XP2-6400 4-4-4-12 Muskins. They won't run stable at 950 5-5-5-15 where as the previous 2x1GB Corsairs would. They won't even boot at 1000 (FSB 400 with 4:5 ratio). I tried voltages between 1.9V and 2.3V.