In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GTX 1660 Zotac Gaming Amp 6GB are significantly better than the Nvidia GeForce GTX 680 Galaxy Edition.

The GTX 1660 has a 420 MHz higher core clock speed than the GTX 680, but the GTX 680 has 40 more Texture Mapping Units than the GTX 1660. As a result, the GTX 680 exhibits a 7.5 GTexel/s better Texture Fill Rate than the GTX 1660. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The GTX 1660 has a 420 MHz higher core clock speed and 16 more Render Output Units than the GTX 680. This results in the GTX 1660 providing 37.9 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 1660 was released over three years more recently than the GTX 680, and so the GTX 1660 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 1660 has 2048 MB more video memory than the GTX 680, so is likely to be much better at displaying game textures at higher resolutions. However, the overall memory performance is about the same.

The GTX 680 has 0.2 GB/sec greater memory bandwidth than the GTX 1660, which means that the memory performance of the GTX 680 is marginally better than the GTX 1660.

The GeForce GTX 1660 Zotac Gaming Amp 6GB has 1408 Shader Processing Units and the GeForce GTX 680 Galaxy Edition has 1536. However, the actual shader performance of the GTX 1660 is 2598 and the actual shader performance of the GTX 680 is 1806. The GTX 1660 having 792 better shader performance and an altogether better performance when taking into account other relevant data means that the GTX 1660 delivers a massively smoother and more efficient experience when processing graphical data than the GTX 680.

The GTX 1660 transistor size technology is 16 nm (nanometers) smaller than the GTX 680. This means that the GTX 1660 is expected to run slightly cooler and achieve higher clock frequencies than the GTX 680.

The GeForce GTX 1660 Zotac Gaming Amp 6GB requires 130 Watts to run and the GeForce GTX 680 Galaxy Edition requires 195 Watts. We would recommend a PSU with at least 450 Watts for the GTX 1660 and a PSU with at least 550 Watts for the GTX 680. The GTX 680 requires 65 Watts more than the GTX 1660 to run. The difference is significant enough that the GTX 680 may have an adverse affect on your yearly electricity bills in comparison to the GTX 1660.