In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GTX 780 SLI are significantly better than the Nvidia GeForce GTX 770 Zotac AMP! Edition.

The GTX 770 has a 287 MHz higher core clock speed than the GTX 780, but the GTX 780 has 256 more Texture Mapping Units than the GTX 770. As a result, the GTX 780 exhibits a 184.2 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 287 MHz higher core clock speed than the GTX 780, but the GTX 780 has 64 more Render Output Units than the GTX 770. As a result, the GTX 780 exhibits a 46 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 GTX 770 was released less than a year after the GTX 780, 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 GTX 780 has 4096 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 GTX 780 also has superior memory performance overall.

The GTX 780 has 346.4 GB/sec greater memory bandwidth than the GTX 770, which means that the memory performance of the GTX 780 is massively better than the GTX 770.

The GeForce GTX 770 Zotac AMP! Edition has 1536 Shader Processing Units and the GeForce GTX 780 SLI has 4608. However, the actual shader performance of the GTX 770 is 1846 and the actual shader performance of the GTX 780 is 4156. The GTX 780 having 2310 better shader performance and an altogether better performance when taking into account other relevant data means that the GTX 780 delivers a massively smoother and more efficient experience when processing graphical data than the GTX 770.

The GeForce GTX 780 SLI requires 500 Watts to run but there is no entry for the GTX 770. We would recommend a PSU with at least 600 Watts for the GTX 770 and a PSU with at least 750 Watts for the GTX 780. The GTX 780 has been recommended a PSU with 150 Watts more than the GTX 770. The difference is significant enough that the GTX 780 may have an adverse affect on your yearly electricity bills in comparison to the GTX 770.