Overclocking Crucial Ballistix PC2 8500 double sided

[lukesky]

I can overclock them 1200MHZ + bellow 2.2V but I can never pass the Prime 95 test. They pass the memtest 86. Is there anyway else to confirm that the ram is stable?

I'm running the sticks on a P5K Deluxe and Q9300 CPU.

Any ideas? Should I bump the voltage North Bridge?