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Gaming Performance Comparison
In terms of overall gaming performance, the graphical capabilities of the Nvidia GeForce GT 740M are noticeably better than the Nvidia GeForce GT 640M.
The GeForce GT 740M has a 185 MHz higher core clock speed and the same number of Texture Mapping Units as the GeForce GT 640M. This results in the GeForce GT 740M providing 5.9 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 740M has a 185 MHz higher core clock speed than the GeForce GT 640M and the same number of Render Output Units. This results in the GeForce GT 740M providing 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 GeForce GT 740M was released over a year more recently than the GeForce GT 640M, and so the GeForce GT 740M is likely to have better driver support, meaning it will be more optimized for running the latest games.
The GeForce GT 740M and the GeForce GT 640M have the same amount of video memory, but are likely to provide slightly different experiences when displaying game textures at high resolutions.
The memory bandwidth of the GeForce GT 740M and the GeForce GT 640M are the same, which means the GeForce GT 740M and the GeForce GT 640M have equal limitations when it comes to graphical data transfer.
Both the GeForce GT 740M and the GeForce GT 640M have 384 Shader Processing Units. Having the same number of SPUs and using the same architecture means that the performance they offer can be compared by looking at the memory bandwidth, Texture and Pixel Rates. In this case, the GeForce GT 740M has 5.9 GTexel/s better Texture Fill Rate and 3 GPixel/s better Pixel Fill Rate, but the has GB/sec greater memory bandwidth. Although the GPUs are very similar in performance, the GeForce GT 740M takes the edge.
The GeForce GT 740M requires 33 Watts to run and the GeForce GT 640M requires 32 Watts. The GeForce GT 740M requires 1 Watts more than the GeForce GT 640M to run. The difference is not significant enough for the GeForce GT 740M to have a noticeably larger impact on your yearly electricity bills than the GeForce GT 640M.
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|Max Power||33 Watts||vs||32 Watts|
|Recommended RAM||6 GB||vs||6 GB|
|Recommended Screen Size||1366x768||1366x768|
|Mini Review||GeForce GT 740M is a middle-class mobile graphics card based on the 28nm, Kepler architecture. |
It's based on the Kepler GK107 Core and offers 384 Shader Processing Units, 32 TMUs and 16 ROPs, on a 128-bit memory interface of DDR3. The central unit runs at 810MHz (890MHz in Turbo Mode) and the memory clock operates at up to 900MHz.
Its performance is therefore similar (though slower) to the DDR3 Variant of previous GeForce GT 650M and so most modern games will run at medium or high settings. Its power consumption should be lower, thanks to the power optimizations.
This Graphics Card needs to be paired with an average Quad Core CPU and can only achieve fluent frame rates at 1366x768.
|GeForce GT 640M is a middle-class mobile GPU based on the 28nm Kepler GK107 Core. |
It offers 384 Shader Processing Units, 32 TMUs and 16 ROPs on a 128-bit memory interface of 2GB DDR3 (though GDDR5 is also supported but it most likely won't be used due to the increased cost and small performance boost). The central clock runs at 625MHz (709MHz in Turbo Mode) and the memory clock operates at 900MHz. Expect a power consumption of up to 32 Watt.
Benchmarks indicate its performance is quite average and that some modern demanding games are playable at high settings using a 720p resolution though small tweaks will be required to achieve more fluent (30+) FPS.