In terms of overall gaming performance, the graphical capabilities of the AMD Radeon R9 390X XFX Double Dissipation Black 8GB Edition are massively better than the Nvidia GeForce GT 940 2GB.

The GT 940 has no core clock speed set, so any comparison between Texture and Pixel Fill Rates is not currently possible.

The GT 940 was released over a year more recently than the R9 390X, and so the GT 940 is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the R9 390X.

The R9 390X has 6144 MB more video memory than the GT 940, so is likely to be much better at displaying game textures at higher resolutions. This is supported by the fact that the R9 390X also has superior memory performance overall.

The R9 390X has 304 GB/sec greater memory bandwidth than the GT 940, which means that the memory performance of the R9 390X is massively better than the GT 940.

The Radeon R9 390X XFX Double Dissipation Black 8GB Edition has 2816 Shader Processing Units and the GeForce GT 940 2GB has 512. However, the actual shader performance of the R9 390X is 2609 and the actual shader performance of the GT 940 is 0. The R9 390X having 2609 better shader performance and an altogether better performance when taking into account other relevant data means that the R9 390X delivers a massively smoother and more efficient experience when processing graphical data than the GT 940.

The Radeon R9 390X XFX Double Dissipation Black 8GB Edition requires 300 Watts to run and the GeForce GT 940 2GB requires 60 Watts. We would recommend a PSU with at least 750 Watts for the R9 390X and a PSU with at least 300 Watts for the GT 940. The R9 390X requires 240 Watts more than the GT 940 to run. The difference is significant enough that the R9 390X may have an adverse affect on your yearly electricity bills in comparison to the GT 940.