In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GT 730 v3 Gigabyte 2GB Edition are significantly better than the Nvidia GeForce GT 620.

The GT 730 and the GeForce GT 620 have both the same core clock speed and the same Texture Fill Rate. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The GT 730 and the GeForce GT 620 have both the same core clock speed and the same Pixel Fill Rate. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The GT 730 was released over a year more recently than the GeForce GT 620, and so the GT 730 is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the GeForce GT 620.

The GT 730 has 1024 MB more video memory than the GeForce GT 620, so is likely to be much better at displaying game textures at higher resolutions. This is supported by the fact that the GT 730 also has superior memory performance overall.

The GT 730 has 14.4 GB/sec greater memory bandwidth than the GeForce GT 620, which means that the memory performance of the GT 730 is slightly better than the GeForce GT 620.

Both the GeForce GT 730 v3 Gigabyte 2GB Edition and the GeForce GT 620 have 96 Shader Processing Units. The two GPUs are based on different architectures, but deliver an equivalent shader performance. To compare, we must continue to look at the memory bandwidth, Texture and Pixel Rates. In this case, although the GPUs are very similar in performance, the GT 730 takes the edge.

The GeForce GT 730 v3 Gigabyte 2GB Edition requires 49 Watts to run and the GeForce GT 620 requires 49 Watts. We would recommend a PSU with at least 300 Watts for the GT 730 and a PSU with at least 300 Watts for the GeForce GT 620. The two GPUs require the same amount of wattage to run. As such, there is no need to worry about which will more significantly affect your yearly electricity bills.