In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GTX Titan SLI are very slightly better than the Nvidia GeForce GTX 780 Ti EVGA Classified Kingpin Edition.

The GTX 780 Ti has a 235 MHz higher core clock speed than the GTX Titan, but the GTX Titan has 208 more Texture Mapping Units than the GTX 780 Ti. As a result, the GTX Titan exhibits a 117.7 GTexel/s better Texture Fill Rate than the GTX 780 Ti. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The GTX 780 Ti has a 235 MHz higher core clock speed than the GTX Titan, but the GTX Titan has 48 more Render Output Units than the GTX 780 Ti. As a result, the GTX Titan exhibits a 28.9 GPixel/s better Pixel Fill Rate than the GTX 780 Ti. 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 Titan, 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 Titan has 9216 MB more video memory than the GTX 780 Ti, so is likely to be much better at displaying game textures at higher resolutions. This is supported by the fact that the GTX Titan also has superior memory performance overall.

The GTX Titan has 240.8 GB/sec greater memory bandwidth than the GTX 780 Ti, which means that the memory performance of the GTX Titan is massively better than the GTX 780 Ti.

The GeForce GTX 780 Ti EVGA Classified Kingpin Edition has 2880 Shader Processing Units and the GeForce GTX Titan SLI has 5376. However, the actual shader performance of the GTX 780 Ti is 3275 and the actual shader performance of the GTX Titan is 4709. The GTX Titan having 1434 better shader performance and an altogether better performance when taking into account other relevant data means that the GTX Titan delivers a massively smoother and more efficient experience when processing graphical data than the GTX 780 Ti.

The GeForce GTX 780 Ti EVGA Classified Kingpin Edition requires 250 Watts to run and the GeForce GTX Titan SLI requires 500 Watts. We would recommend a PSU with at least 600 Watts for the GTX 780 Ti. The GTX Titan requires 250 Watts more than the GTX 780 Ti to run. The difference is significant enough that the GTX Titan may have an adverse affect on your yearly electricity bills in comparison to the GTX 780 Ti.