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

The GTX 770 has a 275 MHz higher core clock speed than the GTX 780 Ti, but the GTX 780 Ti has 352 more Texture Mapping Units than the GTX 770. As a result, the GTX 780 Ti exhibits a 272.8 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 275 MHz higher core clock speed than the GTX 780 Ti, but the GTX 780 Ti has 64 more Render Output Units than the GTX 770. As a result, the GTX 780 Ti exhibits a 47.2 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 780 Ti was released less than a year after the GTX 770, 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 Ti 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 Ti also has superior memory performance overall.

The GTX 780 Ti has 441.6 GB/sec greater memory bandwidth than the GTX 770, which means that the memory performance of the GTX 780 Ti is massively better than the GTX 770.

The GeForce GTX 780 Ti SLI has 5760 Shader Processing Units and the GeForce GTX 770 Zotac AMP! Edition has 1536. However, the actual shader performance of the GTX 780 Ti is 5345 and the actual shader performance of the GTX 770 is 1846. The GTX 780 Ti having 3499 better shader performance and an altogether better performance when taking into account other relevant data means that the GTX 780 Ti delivers a massively smoother and more efficient experience when processing graphical data than the GTX 770.

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