Henry Chinaski said:
Try first 800Mhz CL5,5,5,15 @2.0V
If it works, you can try 1066Mhz CL6,6,6,18 @2.0V
Anyway, you can use the "cpu-z" which says you the default timings for each speed (533,667,800,1066) and for each module.
I've tried 800Mhz CL5,5,5,15 and 1066Mhz CL6,6,6,18 @ 1.8V, you think 2.0V would differ the result?