Increased power to Gecko 201's

Hi All
I have a question for the electronic minded in the group , I have a
Bridgeport clone about 20 years old it has 3.1 Volt 6.2 amp 1100 oz.
steppers on it and I'm running it with 3 Gecko 201's at 38 Volts ( full
load ), I just acquired a transformer that will give me 70 Volts dc. ( a
little higher than I hoped for )
What kind of increase in speed and or torque would this give me.

Thanks
Ron