> What are we supposed to do with this information?

Nothing. It’s just fun.

> t would have been more meaningful if the author tried the GPU card with an old machine, rather than a Raspberry Pi

But then it would have been lame. Who cares? If your old machine is a x86 less than 10 years old it’s most likely faster than the Pi. But that’s not the point. The point is to pair a cheap fun computer with a humongous and expensive card and see if it works. Because it’s fun.