For myself it would be the support of Cuda that makes the difference. Even if AMD cards were 2-4x the performance in games it would just mean I'd have to consider owning an AMD for gaming and an Nvidia for cuda compatibility. Nvidia is in the same boat now that IBM was in the 80s and Intel in the 90s, in that you're paying a premium for the de facto hardware standard, whether it be due to superior architecture or it simply having a critical mass of the overall install base that it influences how applications are written. If you buy an Nvidia card then you have peace of mind that if XYZ application or feature has some GPU acceleration then your GPU will be supported, whether that be cuda/ml/ai, nvenc, rt, dlss, gsync, etc.The sad part is, even if AMD came out with legitimately superior product, brushed up their raytracing and such, people would still buy nvidia in bulk based on their branding alone. People have just been conditioned to believe Nvidia is the only viable product in existence. The apple effect