GeForce GT 640 DDR3 vs GeForce RTX 3080 12 GB

Intro

Compare those specs to the GeForce RTX 3080 12 GB, which comes with GPU clock speed of 1260 MHz, and 12288 MB of GDDR6X memory running at 1188 MHz through a 384-bit bus. It also is comprised 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

The GeForce RTX 3080 12 GB, in theory, should be much faster 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 is much (more or less 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

The GeForce RTX 3080 12 GB is a lot (about 880%) more effective at full screen anti-aliasing than the GeForce GT 640 DDR3, and will be able to handle higher resolutions while still performing well. (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: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be transferred over the external memory interface in a second. The number is calculated by multiplying the bus width by the speed of its memory. If the card has DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, 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 are processed in one second. This number is calculated by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant 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.