So I wondered what it would give to run 2smp's on a dualcore. I tested it on a E6750 @3GHz.

I had frametimes of about 13minutes with one smp. Now with 2smp's it takes 20minutes. So I suddenly gain 6minutes out of thin air?

And a caution to everyone to check if you can do this before you do it. One smp was about 22hours so with 2smp's I can still keep a big enough margin.
Don't do this unless you are 100% certain you still have a very big margin!