In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GTX 660 Ti SLI are significantly better than the Nvidia GeForce GTX 460 SLI.

The GTX 660 Ti has a 240 MHz higher core clock speed and 112 more Texture Mapping Units than the GTX 460. This results in the GTX 660 Ti providing 129.4 GTexel/s better texturing performance. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The GTX 660 Ti has a 240 MHz higher core clock speed but 16 fewer Render Output Units than the GTX 460. The lower ROP count doesn't matter, though, as altogether the GTX 660 Ti manages to provide 0.7 GPixel/s better pixeling performance. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The GTX 660 Ti was released over a year more recently than the GTX 460, and so the GTX 660 Ti is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the GTX 460.

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 660 Ti has 2048 MB more video memory than the GTX 460, so is likely to be much better at displaying game textures at higher resolutions. This is supported by the fact that the GTX 660 Ti also has superior memory performance overall.

The GTX 660 Ti has 58 GB/sec greater memory bandwidth than the GTX 460, which means that the memory performance of the GTX 660 Ti is much better than the GTX 460.

The GeForce GTX 460 SLI has 672 Shader Processing Units and the GeForce GTX 660 Ti SLI has 2688. However, the actual shader performance of the GTX 460 is 907 and the actual shader performance of the GTX 660 Ti is 2634. The GTX 660 Ti having 1727 better shader performance and an altogether better performance when taking into account other relevant data means that the GTX 660 Ti delivers a massively smoother and more efficient experience when processing graphical data than the GTX 460.

The GTX 660 Ti transistor size technology is 12 nm (nanometers) smaller than the GTX 460. This means that the GTX 660 Ti is expected to run slightly cooler and achieve higher clock frequencies than the GTX 460.

The GeForce GTX 460 SLI requires 380 Watts to run and the GeForce GTX 660 Ti SLI requires 300 Watts. We would recommend a PSU with at least 600 Watts for the GTX 460. The GTX 460 requires 80 Watts more than the GTX 660 Ti to run. The difference is significant enough that the GTX 460 may have an adverse affect on your yearly electricity bills in comparison to the GTX 660 Ti.