GeForce GT 640 DDR3 vs GeForce RTX 3080 12 GB

Intro

Compare those specs to the GeForce RTX 3080 12 GB, which comes with clock speeds of 1260 MHz on the GPU, and 1188 MHz on the 12288 MB of GDDR6X RAM. It features 8960 SPUs as well as 280 TAUs and 112 ROPs.

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

In theory, the GeForce RTX 3080 12 GB 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 a lot (about 1125%) more effective at anisotropic 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 resolution is important to you, then the GeForce RTX 3080 12 GB is the winner, 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: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be moved across the external memory interface within a second. The number is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 once again. If it uses 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 are applied in one second. This number is calculated by multiplying the total number of texture units by the core clock 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 in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number 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 rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.