GeForce RTX 3080 12 GB vs Geforce GTX 780

Intro

Compare those specs to the Geforce GTX 780, which makes use of a 28 nm design. nVidia has set the core speed at 863 MHz. The GDDR5 memory runs at a frequency of 1502 MHz on this card. It features 2304 SPUs along with 192 Texture Address Units and 48 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Geforce GTX 780		250 Watts
GeForce RTX 3080 12 GB		350 Watts
	Difference: 100 Watts (40%)

Memory Bandwidth

In theory, the GeForce RTX 3080 12 GB should be 224% faster than the Geforce GTX 780 in general, due to its greater data rate. (explain)

GeForce RTX 3080 12 GB		934298 MB/sec
Geforce GTX 780		288384 MB/sec
	Difference: 645914 (224%)

Texel Rate

The GeForce RTX 3080 12 GB should be quite a bit (about 113%) faster with regards to texture filtering than the Geforce GTX 780. (explain)

GeForce RTX 3080 12 GB		352800 Mtexels/sec
Geforce GTX 780		165696 Mtexels/sec
	Difference: 187104 (113%)

Pixel Rate

The GeForce RTX 3080 12 GB will be quite a bit (about 241%) better at FSAA than the Geforce GTX 780, and also able to handle higher screen resolutions while still performing well. (explain)

GeForce RTX 3080 12 GB		141120 Mpixels/sec
Geforce GTX 780		41424 Mpixels/sec
	Difference: 99696 (241%)

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 (counted in MB per second) that can be transferred past the external memory interface in a second. It is calculated by multiplying the card's bus width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly write to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.