In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GT 740 are significantly better than the Nvidia GeForce GT 730.
The GeForce GT 740 has a 91 MHz higher core clock speed and 16 more Texture Mapping Units than the GeForce GT 730. This results in the GeForce GT 740 providing 17.4 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 GeForce GT 740 has a 91 MHz higher core clock speed and 8 more Render Output Units than the GeForce GT 730. This results in the GeForce GT 740 providing 8.7 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 GeForce GT 730 was released less than a year after the GeForce GT 740, and so they are likely to have similar driver support for optimizing performance when running the latest games.
The GeForce GT 730 and the GeForce GT 740 have the same amount of video memory, but are likely to provide slightly different experiences when displaying game textures at high resolutions.
The GeForce GT 740 has 14.4 GB/sec greater memory bandwidth than the GeForce GT 730, which means that the memory performance of the GeForce GT 740 is slightly better than the GeForce GT 730.
Both the GeForce GT 730 and the GeForce GT 740 have 384 Shader Processing Units. While the two GPUs have the same number of SPUs, the actual performance delivered by the . Knowing that the shader performance of the GeForce GT 740 is superior, it is not necessary to examine the GPUs' respective Texture and Pixel Fill Rates.
source- gamedebate