GeForce GT 640 DDR3 vs GeForce RTX 2070 Super

Intro

Compare those specifications to the GeForce RTX 2070 Super, which comes with a clock frequency of 1605 MHz and a GDDR6 memory speed of 1750 MHz. It also uses a 256-bit bus, and makes use of a 12 nm design. It features 2560 SPUs, 160 TAUs, and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce RTX 2070 Super		215 Watts
	Difference: 150 Watts (231%)

Memory Bandwidth

Performance-wise, the GeForce RTX 2070 Super should in theory be much better than the GeForce GT 640 DDR3 in general. (explain)

GeForce RTX 2070 Super		458752 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 401728 (704%)

Texel Rate

The GeForce RTX 2070 Super is quite a bit (more or less 792%) faster with regards to texture filtering than the GeForce GT 640 DDR3. (explain)

GeForce RTX 2070 Super		256800 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 228000 (792%)

Pixel Rate

The GeForce RTX 2070 Super will be quite a bit (about 613%) better at anti-aliasing than the GeForce GT 640 DDR3, and should be capable of handling higher screen resolutions while still performing well. (explain)

GeForce RTX 2070 Super		102720 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 88320 (613%)

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: Bandwidth is the largest amount of data (in units of megabytes per second) that can be transferred over the external memory interface in one second. It's worked out by multiplying the interface width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.