GeForce RTX 3080 Ti vs Radeon RX 6900 XT

Intro

Compare those specs to the Radeon RX 6900 XT, which features core clock speeds of 1825 MHz on the GPU, and 2000 MHz on the 16384 MB of GDDR6 RAM. It features 5120 SPUs along with 320 Texture Address Units and 128 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6900 XT		300 Watts
GeForce RTX 3080 Ti		350 Watts
	Difference: 50 Watts (17%)

Memory Bandwidth

The GeForce RTX 3080 Ti, in theory, should be a lot faster than the Radeon RX 6900 XT overall. (explain)

GeForce RTX 3080 Ti		934297 MB/sec
Radeon RX 6900 XT		524288 MB/sec
	Difference: 410009 (78%)

Texel Rate

The Radeon RX 6900 XT is quite a bit (approximately 34%) more effective at texture filtering than the GeForce RTX 3080 Ti. (explain)

Radeon RX 6900 XT		584000 Mtexels/sec
GeForce RTX 3080 Ti		436800 Mtexels/sec
	Difference: 147200 (34%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon RX 6900 XT is superior to the GeForce RTX 3080 Ti, by a large margin. (explain)

Radeon RX 6900 XT		233600 Mpixels/sec
GeForce RTX 3080 Ti		152880 Mpixels/sec
	Difference: 80720 (53%)

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 information (counted in megabytes per second) that can be transported over the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs 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 also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.