GeForce RTX 3090 vs Radeon RX 6800 XT

Intro

Compare those specifications to the Radeon RX 6800 XT, which features GPU core speed of 1825 MHz, and 16384 MB of GDDR6 RAM set to run at 2000 MHz through a 256-bit bus. It also features 4608 Stream Processors, 288 Texture Address Units, and 128 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6800 XT		300 Watts
GeForce RTX 3090		350 Watts
	Difference: 50 Watts (17%)

Memory Bandwidth

The GeForce RTX 3090, in theory, should perform much faster than the Radeon RX 6800 XT overall. (explain)

GeForce RTX 3090		958668 MB/sec
Radeon RX 6800 XT		524288 MB/sec
	Difference: 434380 (83%)

Texel Rate

The Radeon RX 6800 XT is a small bit (more or less 15%) faster with regards to AF than the GeForce RTX 3090. (explain)

Radeon RX 6800 XT		525600 Mtexels/sec
GeForce RTX 3090		457560 Mtexels/sec
	Difference: 68040 (15%)

Pixel Rate

The Radeon RX 6800 XT should be quite a bit (more or less 50%) faster with regards to anti-aliasing than the GeForce RTX 3090, and should be able to handle higher resolutions without losing too much performance. (explain)

Radeon RX 6800 XT		233600 Mpixels/sec
GeForce RTX 3090		156240 Mpixels/sec
	Difference: 77360 (50%)

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 MB per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the interface width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.