In terms of overall gaming performance, the graphical capabilities of the AMD Radeon HD 7750 Gigabyte 1GB OC Edition are massively better than the Nvidia GeForce GT 610 Galaxy 2GB GC Edition.
The HD 7750 has a 60 MHz higher core clock speed and 24 more Texture Mapping Units than the GT 610. This results in the HD 7750 providing 21.6 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 HD 7750 has a 60 MHz higher core clock speed and 12 more Render Output Units than the GT 610. This results in the HD 7750 providing 10.8 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 GT 610 was released less than a year after the HD 7750, and so they are likely to have similar driver support for optimizing performance when running the latest games.
The GT 610 has 1024 MB more video memory than the HD 7750, so is likely to be much better at displaying game textures at higher resolutions. However, overall, the HD 7750 has superior memory performance.
The HD 7750 has 64 GB/sec greater memory bandwidth than the GT 610, which means that the memory performance of the HD 7750 is much better than the GT 610.
The Radeon HD 7750 Gigabyte 1GB OC Edition has 512 Shader Processing Units and the GeForce GT 610 Galaxy 2GB GC Edition has 48. However, the actual shader performance of the HD 7750 is 406 and the actual shader performance of the GT 610 is 79. The HD 7750 having 327 better shader performance and an altogether better performance when taking into account other relevant data means that the HD 7750 delivers a massively smoother and more efficient experience when processing graphical data than the GT 610.
The HD 7750 transistor size technology is 12 nm (nanometers) smaller than the GT 610. This means that the HD 7750 is expected to run slightly cooler and achieve higher clock frequencies than the GT 610.
We would recommend a PSU with at least 400 Watts for the HD 7750 and a PSU with at least 300 Watts for the GT 610. The HD 7750 has been recommended a PSU with 100 Watts more than the GT 610. The difference is significant enough that the HD 7750 may have an adverse affect on your yearly electricity bills in comparison to the GT 610.