GeForce GT 640 DDR3 vs GeForce RTX 2080

Intro

Compare that to the GeForce RTX 2080, which comes with core speeds of 1515 MHz on the GPU, and 1750 MHz on the 8192 MB of GDDR6 memory. It features 2944 SPUs as well as 184 Texture Address Units and 64 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

GeForce RTX 2080		26155 points
GeForce GT 640 DDR3		1560 points
	Difference: 24595 (1577%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce RTX 2080		215 Watts
	Difference: 150 Watts (231%)

Memory Bandwidth

As far as performance goes, the GeForce RTX 2080 should in theory be quite a bit superior to the GeForce GT 640 DDR3 in general. (explain)

GeForce RTX 2080		458752 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 401728 (704%)

Texel Rate

The GeForce RTX 2080 will be much (approximately 868%) more effective at texture filtering than the GeForce GT 640 DDR3. (explain)

GeForce RTX 2080		278760 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 249960 (868%)

Pixel Rate

The GeForce RTX 2080 is a lot (about 573%) faster with regards to FSAA than the GeForce GT 640 DDR3, and also should be capable of handling higher screen resolutions more effectively. (explain)

GeForce RTX 2080		96960 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 82560 (573%)

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 max amount of data (measured in MB per second) that can be moved over the external memory interface in one second. The number is calculated by multiplying the interface width by its memory speed. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, 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 number is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.