In terms of overall gaming performance, the graphical capabilities of the AMD Radeon R9 295X2 Crossfire are significantly better than the Nvidia GeForce GTX 660 Ti 3-way SLI.

The R9 295X2 has a 103 MHz higher core clock speed and 368 more Texture Mapping Units than the GTX 660 Ti. This results in the R9 295X2 providing 409.3 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 R9 295X2 has a 103 MHz higher core clock speed and 120 more Render Output Units than the GTX 660 Ti. This results in the R9 295X2 providing 129.6 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 R9 295X2 was released over a year more recently than the GTX 660 Ti, and so the R9 295X2 is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the GTX 660 Ti.

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 R9 295X2 has 10240 MB more video memory than the GTX 660 Ti, so is likely to be much better at displaying game textures at higher resolutions. This is supported by the fact that the R9 295X2 also has superior memory performance overall.

The R9 295X2 has 847.4 GB/sec greater memory bandwidth than the GTX 660 Ti, which means that the memory performance of the R9 295X2 is massively better than the GTX 660 Ti.

The Radeon R9 295X2 Crossfire has 11264 Shader Processing Units and the GeForce GTX 660 Ti 3-way SLI has 4032. However, the actual shader performance of the R9 295X2 is 9747 and the actual shader performance of the GTX 660 Ti is 3951. The R9 295X2 having 5796 better shader performance and an altogether better performance when taking into account other relevant data means that the R9 295X2 delivers a massively smoother and more efficient experience when processing graphical data than the GTX 660 Ti.

The Radeon R9 295X2 Crossfire requires 750 Watts to run and the GeForce GTX 660 Ti 3-way SLI requires 450 Watts. We would recommend a PSU with at least 1500 Watts for the R9 295X2. The R9 295X2 requires 300 Watts more than the GTX 660 Ti to run. The difference is significant enough that the R9 295X2 may have an adverse affect on your yearly electricity bills in comparison to the GTX 660 Ti.