GeForce GT 640 DDR3 vs GeForce RTX 2060

Intro

Compare those specs to the GeForce RTX 2060, which makes use of a 12 nm design. nVidia has set the core speed at 1365 MHz. The GDDR6 memory is set to run at a speed of 1750 MHz on this specific card. It features 1920 SPUs as well as 120 Texture Address Units and 48 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce RTX 2060		160 Watts
	Difference: 95 Watts (146%)

Memory Bandwidth

Performance-wise, the GeForce RTX 2060 should theoretically be quite a bit superior to the GeForce GT 640 DDR3 in general. (explain)

GeForce RTX 2060		344064 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 287040 (503%)

Texel Rate

The GeForce RTX 2060 is much (approximately 469%) better at anisotropic filtering than the GeForce GT 640 DDR3. (explain)

GeForce RTX 2060		163800 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 135000 (469%)

Pixel Rate

The GeForce RTX 2060 is a lot (about 355%) faster with regards to full screen anti-aliasing than the GeForce GT 640 DDR3, and will be capable of handling higher resolutions without slowing down too much. (explain)

GeForce RTX 2060		65520 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 51120 (355%)

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 maximum amount of data (in units of MB per second) that can be transferred over the external memory interface within a second. It's worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. 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 output rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.