GeForce RTX 3080 Ti vs Radeon RX 6900 XT

Intro

Compare those specs to the Radeon RX 6900 XT, which comes with a GPU core clock speed of 1825 MHz, and 16384 MB of GDDR6 memory running at 2000 MHz through a 256-bit bus. It also is comprised of 5120 SPUs, 320 TAUs, and 128 Raster Operation Units.

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

Theoretically speaking, the GeForce RTX 3080 Ti should be a lot faster than the Radeon RX 6900 XT in general. (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 anisotropic 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

The Radeon RX 6900 XT will be quite a bit (approximately 53%) more effective at FSAA than the GeForce RTX 3080 Ti, and should be able to handle higher screen resolutions without losing too much performance. (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 maximum amount of information (counted in megabytes per second) that can be moved past the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better 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 can be applied per second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount 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 is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.