GeForce RTX 4090 vs Radeon RX 6800 XT

Intro

Compare those specifications to the Radeon RX 6800 XT, which comes with a clock frequency of 1825 MHz and a GDDR6 memory speed of 2000 MHz. It also features a 256-bit memory bus, and uses a 7 nm design. It is comprised of 4608 SPUs, 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 4090		450 Watts
	Difference: 150 Watts (50%)

Memory Bandwidth

Performance-wise, the GeForce RTX 4090 should in theory be quite a bit superior to the Radeon RX 6800 XT in general. (explain)

GeForce RTX 4090		1042432 MB/sec
Radeon RX 6800 XT		524288 MB/sec
	Difference: 518144 (99%)

Texel Rate

The GeForce RTX 4090 will be much (about 118%) better at texture filtering than the Radeon RX 6800 XT. (explain)

GeForce RTX 4090		1144320 Mtexels/sec
Radeon RX 6800 XT		525600 Mtexels/sec
	Difference: 618720 (118%)

Pixel Rate

The GeForce RTX 4090 should be quite a bit (more or less 68%) more effective at FSAA than the Radeon RX 6800 XT, and also will be capable of handling higher resolutions without losing too much performance. (explain)

GeForce RTX 4090		393360 Mpixels/sec
Radeon RX 6800 XT		233600 Mpixels/sec
	Difference: 159760 (68%)

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 largest amount of data (in units of megabytes per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the interface width by the speed of its memory. If the card has DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, 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 number of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core speed of the card. 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 rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.