Equivalent to "the notebook with the fastest GPU we could find at half the power" is how I remember it... I'm just not entirely certain what GPU performance do

Equivalent to "the notebook with the fastest GPU we could find at half the power" is how I remember it... I'm just not entirely certain what GPU performance does for me...? I don't work with video, there aren't any games, and I'm not playing them, anyway. Does iTerm2 scrolling get better? I used to be quite happy with the GeForce 7xx(?) and tensorflow, and this seems like it would have quite a bit of power for ML. Unfortunately, the software just isn't there (yet?).