In terms of overall gaming performance, the graphical capabilities of the Intel UHD Graphics 630 are marginally better than the Nvidia GeForce GT 640.

The GeForce GT 640 has a 552 MHz higher core clock speed and 9 more Texture Mapping Units than the UHD Graphics 630. This results in the GeForce GT 640 providing 20.8 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 640 has a 552 MHz higher core clock speed and 13 more Render Output Units than the UHD Graphics 630. This results in the GeForce GT 640 providing 13.3 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 UHD Graphics 630 was released over three years more recently than the GeForce GT 640, and so the UHD Graphics 630 is likely to have far better driver support, meaning it will be much more optimized and ultimately superior to the GeForce GT 640 when running the latest games.

The GeForce GT 640 has 2048 MB video memory, but the UHD Graphics 630 does not have an entry, so the two GPUs cannot be reliably compared in this area.

The UHD Graphics 630 has 184 Shader Processing Units and the GeForce GT 640 has 384. However, the actual shader performance of the UHD Graphics 630 is 212 and the actual shader performance of the GeForce GT 640 is 346. The GeForce GT 640 having 134 better shader performance and an altogether better performance when taking into account other relevant data means that the GeForce GT 640 delivers a noticeably smoother and more efficient experience when processing graphical data than the UHD Graphics 630.

The UHD Graphics 630 transistor size technology is 14 nm (nanometers) smaller than the GeForce GT 640. This means that the UHD Graphics 630 is expected to run slightly cooler and achieve higher clock frequencies than the GeForce GT 640. While they exhibit similar graphical performance, the UHD Graphics 630 should consume less power than the GeForce GT 640.

The UHD Graphics 630 requires 15 Watts to run and the GeForce GT 640 requires 65 Watts. We would recommend a PSU with at least 350 Watts for the GeForce GT 640, but we do not have a recommended PSU wattage for the UHD Graphics 630. The GeForce GT 640 requires 50 Watts more than the UHD Graphics 630 to run. The difference is significant enough that the GeForce GT 640 may have a slight adverse affect on your yearly electricity bills in comparison to the UHD Graphics 630.