It should be pretty good. It is almost the latest generation, it has enough VRAM, it is NVidia, which usually works very well with ARCHICAD.
I have a 460M, which is 5 generations older and it still works fine.
So a 960 should be pretty good for the next several years.
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AMD Ryzen 1700X CPU, 48 GB RAM, Nvidia GTX 1060 6GB, 500 GB NVMe SSD
2x28" (2560x1440), WIN10 PRO ENG, AC20-AC26
Loving Archicad since 1995