Hi
I don't know of any way to get the index without it.
It doesn't mean much anyway.
I have about as fast a computer as you could buy a year ago, but my index is limited by hard drive performance to 5.9 even though all the other aspects check out at 7.7 to 7.8. out of a possible 7.9.
The only thing I could do to improve it would be to use solid state hard drives.
So the figure doesn't really mean a lot anyway.
Mike