GeForce GT 640 DDR3 vs GeForce RTX 3080 12 GB

Intro

Compare that to the GeForce RTX 3080 12 GB, which features a clock speed of 1260 MHz and a GDDR6X memory speed of 1188 MHz. It also features a 384-bit bus, and makes use of a 8 nm design. It is made up of 8960 SPUs, 280 TAUs, and 112 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce RTX 3080 12 GB		350 Watts
	Difference: 285 Watts (438%)

Memory Bandwidth

Performance-wise, the GeForce RTX 3080 12 GB should in theory be a lot better than the GeForce GT 640 DDR3 in general. (explain)

GeForce RTX 3080 12 GB		934298 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 877274 (1538%)

Texel Rate

The GeForce RTX 3080 12 GB will be much (about 1125%) faster with regards to texture filtering than the GeForce GT 640 DDR3. (explain)

GeForce RTX 3080 12 GB		352800 Mtexels/sec
GeForce GT 640 DDR3		28800 Mtexels/sec
	Difference: 324000 (1125%)

Pixel Rate

If using a high screen resolution is important to you, then the GeForce RTX 3080 12 GB is superior to the GeForce GT 640 DDR3, and very much so. (explain)

GeForce RTX 3080 12 GB		141120 Mpixels/sec
GeForce GT 640 DDR3		14400 Mpixels/sec
	Difference: 126720 (880%)

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 max amount of data (counted in megabytes per second) that can be transferred over the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This 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 graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.