If you are planning on getting many nVidia enhanced pc games that use PhysX and cuda then that should make you buy the 680. If you won't be doing anything involving these things then your still just as stuck.
OS: Windows 10 64 bit Professional
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
CPU: AMD Ryzen 5900X
RAM: 16GB
GPU: Radeon Vega 56
