There is, by asking.
By asking, I've found out that by default, it will throttle. I wouldn't have known that without asking.
As an early adopter you are taking a chance due to the fact hardly anyone will be able to give you a proper answer yet.
There is nothing wrong with buying something and then sending it back if you're not happy with an aspect of it you could never have been sure about.
Obviously once they've been out for a bit there is no need to consider this.
I have bought my MSI Aero 1070 completely on faith. There are no reviews and I have no idea whether it's even really as long as it's supposed to be.
I would only send it back if I was very unhappy with it for some reason.