To be honest a setup like this wouldn't be too bad at all
NX - Portable Mode (Running on Battery Power) = 350-400 GFLOPS, can run PS4 ports at 960x540 resolution, Wii U level+ games at 720p.
NX - Home Mode (Home Dock Actively Cools Unit) = Full 700 GF- 1 TFLOP, can run PS4 ports at 720p or 900p without much fuss.
NX - Supplemental Compute Device Mode (SCD adds second Tegra X2 processor to work in unison, doubles horsepower to 1.5 TFLOP-2 TFLOP) = Can Run games at 1080P. Optional add-on.