In terms of overall gaming performance, the graphical capabilities of the AMD Radeon R7 250 v2 XFX Core 1GB Edition are noticeably better than the Nvidia GeForce GT 640.

The R7 250 has a 98 MHz higher core clock speed than the GeForce GT 640, but the GeForce GT 640 has 8 more Texture Mapping Units than the R7 250. As a result, the GeForce GT 640 exhibits a 4.9 GTexel/s better Texture Fill Rate than the R7 250. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.

The R7 250 has a 98 MHz higher core clock speed than the GeForce GT 640, but the GeForce GT 640 has 8 more Render Output Units than the R7 250. As a result, the GeForce GT 640 exhibits a 6.4 GPixel/s better Pixel Fill Rate than the R7 250. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.

The R7 250 was released over a year more recently than the GeForce GT 640, and so the R7 250 is likely to have better driver support, meaning it will be more optimized for running the latest games when compared to the GeForce GT 640.

The GeForce GT 640 has 1024 MB more video memory than the R7 250, so is likely to be much better at displaying game textures at higher resolutions. This is supported by the fact that the GeForce GT 640 also has superior memory performance overall.

The GeForce GT 640 has 2.9 GB/sec greater memory bandwidth than the R7 250, which means that the memory performance of the GeForce GT 640 is marginally better than the R7 250.

Both the Radeon R7 250 v2 XFX Core 1GB Edition and the GeForce GT 640 have 384 Shader Processing Units. While the two GPUs have the same number of SPUs, the actual performance delivered by the GeForce GT 640 is 346 and by the R7 250 is 346. Knowing that the shader performance of the GeForce GT 640 is superior, it is not necessary to examine the GPUs' respective Texture and Pixel Fill Rates.

The Radeon R7 250 v2 XFX Core 1GB Edition requires 65 Watts to run and the GeForce GT 640 requires 65 Watts. We would recommend a PSU with at least 400 Watts for the R7 250 and a PSU with at least 350 Watts for the GeForce GT 640. 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.