In terms of overall gaming performance, the graphical capabilities of the AMD Radeon R9 390X XFX Double Dissipation Black 8GB Edition are marginally better than the AMD Radeon R9 390X Sapphire Tri-X 8GB Edition.

The R9 390X has a 35 MHz higher core clock speed and the same number of Texture Mapping Units as the R9 390X. This results in the R9 390X providing 6.1 GTexel/s better texturing performance. 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 35 MHz higher core clock speed than the R9 390X and the same number of Render Output Units. This results in the R9 390X providing 2.3 GPixel/s better pixeling performance. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

Both the Radeon R9 390X XFX Double Dissipation Black 8GB Edition and the Radeon R9 390X Sapphire Tri-X 8GB Edition were released at the same time, so are likely to be quite similar.

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 Radeon R9 390X XFX Double Dissipation Black 8GB Edition and the Radeon R9 390X Sapphire Tri-X 8GB Edition have the same amount of video memory, but are likely to provide slightly different experiences when displaying game textures at high resolutions.

The memory bandwidth of the Radeon R9 390X XFX Double Dissipation Black 8GB Edition and the Radeon R9 390X Sapphire Tri-X 8GB Edition are the same, which means the R9 390X and the R9 390X have equal limitations when it comes to graphical data transfer.

Both the Radeon R9 390X XFX Double Dissipation Black 8GB Edition and the Radeon R9 390X Sapphire Tri-X 8GB Edition have 2816 Shader Processing Units. Having the same number of SPUs and using the same architecture means that the performance they offer can be compared by looking at the memory bandwidth, Texture and Pixel Rates. In this case, the R9 390X has 6.1 GTexel/s better Texture Fill Rate and 2.3 GPixel/s better Pixel Fill Rate, but the has GB/sec greater memory bandwidth. Although the GPUs are very similar in performance, the R9 390X takes the edge.

The Radeon R9 390X XFX Double Dissipation Black 8GB Edition requires 300 Watts to run and the Radeon R9 390X Sapphire Tri-X 8GB Edition requires 375 Watts. We would recommend a PSU with at least 750 Watts for the R9 390X and a PSU with at least 750 Watts for the R9 390X. The R9 390X requires 75 Watts more than the R9 390X 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 R9 390X.