In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GTX 980 Ti EVGA 6GB Edition are significantly better than the Nvidia GeForce GTX 680 Galaxy Edition.

The GTX 680 has a 110 MHz higher core clock speed than the GTX 980 Ti, but the GTX 980 Ti has 48 more Texture Mapping Units than the GTX 680. As a result, the GTX 980 Ti exhibits a 33.9 GTexel/s better Texture Fill Rate than the GTX 680. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The GTX 680 has a 110 MHz higher core clock speed than the GTX 980 Ti, but the GTX 980 Ti has 64 more Render Output Units than the GTX 680. As a result, the GTX 980 Ti exhibits a 60.5 GPixel/s better Pixel Fill Rate than the GTX 680. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The GTX 980 Ti was released over three years more recently than the GTX 680, and so the GTX 980 Ti is likely to have far better driver support, meaning it will be much more optimized and ultimately superior to the GTX 680 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 980 Ti has 2048 MB more video memory than the GTX 680, so is likely to be much better at displaying game textures at higher resolutions. This is supported by the fact that the GTX 980 Ti also has superior memory performance overall.

The GTX 980 Ti has 144.3 GB/sec greater memory bandwidth than the GTX 680, which means that the memory performance of the GTX 980 Ti is massively better than the GTX 680.

The GeForce GTX 980 Ti EVGA 6GB Edition has 2816 Shader Processing Units and the GeForce GTX 680 Galaxy Edition has 1536. However, the actual shader performance of the GTX 980 Ti is 4091 and the actual shader performance of the GTX 680 is 1806. The GTX 980 Ti having 2285 better shader performance and an altogether better performance when taking into account other relevant data means that the GTX 980 Ti delivers a massively smoother and more efficient experience when processing graphical data than the GTX 680.

The GeForce GTX 980 Ti EVGA 6GB Edition requires 250 Watts to run and the GeForce GTX 680 Galaxy Edition requires 195 Watts. We would recommend a PSU with at least 600 Watts for the GTX 980 Ti and a PSU with at least 550 Watts for the GTX 680. The GTX 980 Ti requires 55 Watts more than the GTX 680 to run. The difference is significant enough that the GTX 980 Ti may have an adverse affect on your yearly electricity bills in comparison to the GTX 680.