GeForce RTX 3080 12 GB vs Radeon RX 6900 XT

Intro

Compare all that to the Radeon RX 6900 XT, which has a core clock speed of 1825 MHz and a GDDR6 memory speed of 2000 MHz. It also uses a 256-bit bus, and uses a 7 nm design. It is comprised of 5120 SPUs, 320 Texture Address Units, and 128 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6900 XT		300 Watts
GeForce RTX 3080 12 GB		350 Watts
	Difference: 50 Watts (17%)

Memory Bandwidth

The GeForce RTX 3080 12 GB, in theory, should perform much faster than the Radeon RX 6900 XT in general. (explain)

GeForce RTX 3080 12 GB		934298 MB/sec
Radeon RX 6900 XT		524288 MB/sec
	Difference: 410010 (78%)

Texel Rate

The Radeon RX 6900 XT is much (about 66%) faster with regards to texture filtering than the GeForce RTX 3080 12 GB. (explain)

Radeon RX 6900 XT		584000 Mtexels/sec
GeForce RTX 3080 12 GB		352800 Mtexels/sec
	Difference: 231200 (66%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon RX 6900 XT is a better choice, by far. (explain)

Radeon RX 6900 XT		233600 Mpixels/sec
GeForce RTX 3080 12 GB		141120 Mpixels/sec
	Difference: 92480 (66%)

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 (measured in megabytes per second) that can be moved past the external memory interface in a second. The number is calculated by multiplying the bus width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better 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 texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total number of texture units by the core clock 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 in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel 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.