GeForce GT 640 DDR3 vs GeForce GTX 1050 3GB

Intro

Compare those specs to the GeForce GTX 1050 3GB, which makes use of a 14 nm design. nVidia has clocked the core frequency at 1392 MHz. The GDDR5 memory runs at a speed of 1750 MHz on this model. It features 768 SPUs as well as 48 TAUs and 24 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce GTX 1050 3GB		75 Watts
	Difference: 10 Watts (15%)

Memory Bandwidth

Theoretically speaking, the GeForce GTX 1050 3GB should perform quite a bit faster than the GeForce GT 640 DDR3 in general. (explain)

GeForce GTX 1050 3GB		86016 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 28992 (51%)

Texel Rate

The GeForce GTX 1050 3GB should be quite a bit (approximately 132%) more effective at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

GeForce GTX 1050 3GB		66816 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 38016 (132%)

Pixel Rate

The GeForce GTX 1050 3GB will be much (about 132%) faster with regards to AA than the GeForce GT 640 DDR3, and also able to handle higher resolutions without slowing down too much. (explain)

GeForce GTX 1050 3GB		33408 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 19008 (132%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be transferred across the external memory interface within a second. It's calculated by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.