GeForce RTX 3090 vs Radeon RX 7900 XT

Intro

Compare all of that to the Radeon RX 7900 XT, which comes with a GPU core clock speed of 1500 MHz, and 20480 MB of GDDR6 RAM running at 2500 MHz through a 320-bit bus. It also features 5376 Stream Processors, 336 TAUs, and 192 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 7900 XT		300 Watts
GeForce RTX 3090		350 Watts
	Difference: 50 Watts (17%)

Memory Bandwidth

The GeForce RTX 3090, in theory, should be a little bit faster than the Radeon RX 7900 XT in general. (explain)

GeForce RTX 3090		958668 MB/sec
Radeon RX 7900 XT		819200 MB/sec
	Difference: 139468 (17%)

Texel Rate

The Radeon RX 7900 XT will be a small bit (more or less 10%) better at anisotropic filtering than the GeForce RTX 3090. (explain)

Radeon RX 7900 XT		504000 Mtexels/sec
GeForce RTX 3090		457560 Mtexels/sec
	Difference: 46440 (10%)

Pixel Rate

The Radeon RX 7900 XT is quite a bit (about 84%) more effective at AA than the GeForce RTX 3090, and will be able to handle higher resolutions while still performing well. (explain)

Radeon RX 7900 XT		288000 Mpixels/sec
GeForce RTX 3090		156240 Mpixels/sec
	Difference: 131760 (84%)

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 data (counted in megabytes per second) that can be moved past the external memory interface in one second. It is calculated by multiplying the bus width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka 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 memory bandwidth is, the lower the ability to get to the maximum fill rate.