GeForce RTX 3080 vs Radeon RX 6900 XT

Intro

Compare that to the Radeon RX 6900 XT, which comes with a clock frequency of 1825 MHz and a GDDR6 memory speed of 2000 MHz. It also uses a 256-bit bus, and makes use of a 7 nm design. It is comprised of 5120 SPUs, 320 Texture Address Units, and 128 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6900 XT		300 Watts
GeForce RTX 3080		320 Watts
	Difference: 20 Watts (7%)

Memory Bandwidth

The GeForce RTX 3080 should theoretically perform a lot faster than the Radeon RX 6900 XT in general. (explain)

GeForce RTX 3080		778547 MB/sec
Radeon RX 6900 XT		524288 MB/sec
	Difference: 254259 (48%)

Texel Rate

The Radeon RX 6900 XT will be much (approximately 49%) more effective at AF than the GeForce RTX 3080. (explain)

Radeon RX 6900 XT		584000 Mtexels/sec
GeForce RTX 3080		391680 Mtexels/sec
	Difference: 192320 (49%)

Pixel Rate

The Radeon RX 6900 XT is a lot (about 69%) better at full screen anti-aliasing than the GeForce RTX 3080, and also able to handle higher resolutions without losing too much performance. (explain)

Radeon RX 6900 XT		233600 Mpixels/sec
GeForce RTX 3080		138240 Mpixels/sec
	Difference: 95360 (69%)

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 max amount of information (measured in MB per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory speed. In the case of DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.