Swap your AMD Radeon RX 570 for my Nvidia GTX 960 2GB?

Did you buy an AMD RX 570 and found its OpenGL performance disappointing compared to Nvidia cards for Zwift? Then today is your lucky day. I have an EVGA GTX 960 SSC 2GB in excellent condition, only used for Zwift, never used for mining, that I am looking to swap out for an AMD RX card. If you are wondering why I would take the inferior performing GPU for Zwift and give you the better one, it’s because while Nvidia is better for OpenGL games (on Windows and Mac), AMD is easier to get working in a Hackintosh for Final Cut Pro with OpenCL acceleration, and I’ve got a load of videos to cut in a short space of time, and I can’t be bothered with eBay or Craigslist randos. To keep it simple, I can ship USPS standard with signature, or local pickup Seattle area.