In terms of overall gaming performance, the graphical capabilities of the AMD Radeon R9 FURY X 4GB are noticeably better than the AMD Radeon R9 390X XFX Double Dissipation Black 8GB Edition.

The R9 390X has a 40 MHz higher core clock speed than the R9 FURY, but the R9 FURY has 80 more Texture Mapping Units than the R9 390X. As a result, the R9 FURY exhibits a 77 GTexel/s better Texture Fill Rate than the R9 390X. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The R9 390X has a 40 MHz higher core clock speed than the R9 FURY and the same number of Render Output Units. This results in the R9 390X providing 2.6 GPixel/s better pixeling performance. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The R9 FURY was released less than a year after the R9 390X, and so they are likely to have similar driver support for optimizing performance when running the latest games.

Both GPUs exhibit very powerful performance, so it probably isn't worth upgrading from one to the other, as both are capable of running even the most demanding games at the highest settings.

The R9 390X has 4096 MB more video memory than the R9 FURY, 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 FURY has 128 GB/sec greater memory bandwidth than the R9 390X, which means that the memory performance of the R9 FURY is massively better than the R9 390X.

The Radeon R9 390X XFX Double Dissipation Black 8GB Edition has 2816 Shader Processing Units and the Radeon R9 FURY X 4GB has 4096. However, the actual shader performance of the R9 390X is 2609 and the actual shader performance of the R9 FURY is 3656. The R9 FURY having 1047 better shader performance and an altogether better performance when taking into account other relevant data means that the R9 FURY delivers a massively smoother and more efficient experience when processing graphical data than the R9 390X.

The Radeon R9 390X XFX Double Dissipation Black 8GB Edition requires 300 Watts to run and the Radeon R9 FURY X 4GB requires 275 Watts. We would recommend a PSU with at least 750 Watts for the R9 390X and a PSU with at least 600 Watts for the R9 FURY. The R9 390X requires 25 Watts more than the R9 FURY to run. The difference is not significant enough for the R9 390X to have a noticeably larger impact on your yearly electricity bills than the R9 FURY.