GeForce GT 640 DDR3 vs GeForce RTX 2070 Super

Intro

Compare all that to the GeForce RTX 2070 Super, which features GPU core speed of 1605 MHz, and 8192 MB of GDDR6 memory set to run at 1750 MHz through a 256-bit bus. It also is made up of 2560 Stream Processors, 160 Texture Address Units, and 64 ROPs.

Display Graphs

Hide Graphs

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

Theoretically speaking, the GeForce RTX 2070 Super should perform a lot faster than the GeForce GT 640 DDR3 overall. (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 will be quite a bit (more or less 792%) better at anisotropic 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 a lot (more or less 613%) faster with regards to FSAA than the GeForce GT 640 DDR3, and also should be able to handle higher resolutions better. (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: Memory bandwidth is the largest amount of data (measured in MB per second) that can be transferred past the external memory interface within a second. It's calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.