In terms of overall gaming performance, the graphical capabilities of the AMD Radeon R9 390 Gigabyte G1 Gaming 8GB Edition Crossfire are significantly better than the Nvidia GeForce GTX 770 Zotac AMP! Edition.

The GTX 770 has a 125 MHz higher core clock speed than the R9 390, but the R9 390 has 192 more Texture Mapping Units than the GTX 770. As a result, the R9 390 exhibits a 180.8 GTexel/s better Texture Fill Rate than the GTX 770. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The GTX 770 has a 125 MHz higher core clock speed than the R9 390, but the R9 390 has 96 more Render Output Units than the GTX 770. As a result, the R9 390 exhibits a 94.4 GPixel/s better Pixel Fill Rate than the GTX 770. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The R9 390 was released over a year more recently than the GTX 770, and so the R9 390 is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the GTX 770.

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 390 has 14336 MB more video memory than the GTX 770, so is likely to be much better at displaying game textures at higher resolutions. This is supported by the fact that the R9 390 also has superior memory performance overall.

The R9 390 has 537.6 GB/sec greater memory bandwidth than the GTX 770, which means that the memory performance of the R9 390 is massively better than the GTX 770.

The Radeon R9 390 Gigabyte G1 Gaming 8GB Edition Crossfire has 5120 Shader Processing Units and the GeForce GTX 770 Zotac AMP! Edition has 1536. However, the actual shader performance of the R9 390 is 4461 and the actual shader performance of the GTX 770 is 1846. The R9 390 having 2615 better shader performance and an altogether better performance when taking into account other relevant data means that the R9 390 delivers a massively smoother and more efficient experience when processing graphical data than the GTX 770.

The Radeon R9 390 Gigabyte G1 Gaming 8GB Edition Crossfire requires 550 Watts to run but there is no entry for the GeForce GTX 770 Zotac AMP! Edition. We would recommend a PSU with at least 800 Watts for the R9 390 and a PSU with at least 600 Watts for the GTX 770. The R9 390 has been recommended a PSU with 200 Watts more than the GTX 770. The difference is significant enough that the R9 390 may have an adverse affect on your yearly electricity bills in comparison to the GTX 770.