Ive had that same problem happen to me a few times but I was using IDE mode, cant remember if it did it with any other bios. I dont have any 7-9-7 runs to compare but I have been able to run 6-9-6 with my gskills. I believe the only difference between these runs was just the timings being tighter main and subs.

7-10-7


6-9-6


another 6-9-6