My GF's 2.26 default is as follows:
798/.9250
1596/1.0
1862/1.0875
2128/1.1750
2261/1.1750
Interesting. I guess even within a model (P8400), Intel/Apple puts them at different stable voltages. Did you ever install CoolBook on her MBP? Would it allow you get down to 0.8750 V, let alone remain stable as low as yours?
Any other members care to share their default freq/voltage pairs?