GeForce RTX 4090 vs Radeon RX 6800

Intro

Compare that to the Radeon RX 6800, which comes with GPU clock speed of 1700 MHz, and 16384 MB of GDDR6 memory set to run at 2000 MHz through a 256-bit bus. It also features 3840 Stream Processors, 240 TAUs, and 96 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6800		250 Watts
GeForce RTX 4090		450 Watts
	Difference: 200 Watts (80%)

Memory Bandwidth

The GeForce RTX 4090 should theoretically be much faster than the Radeon RX 6800 in general. (explain)

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

Texel Rate

The GeForce RTX 4090 should be much (approximately 180%) more effective at anisotropic filtering than the Radeon RX 6800. (explain)

GeForce RTX 4090		1144320 Mtexels/sec
Radeon RX 6800		408000 Mtexels/sec
	Difference: 736320 (180%)

Pixel Rate

If running with a high screen resolution is important to you, then the GeForce RTX 4090 is superior to the Radeon RX 6800, by far. (explain)

GeForce RTX 4090		393360 Mpixels/sec
Radeon RX 6800		163200 Mpixels/sec
	Difference: 230160 (141%)

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 information (measured in megabytes per second) that can be transported past the external memory interface in a second. It's worked out by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better 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 processed in one second. This 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 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 maximum amount of pixels that the graphics card could possibly write to the 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 - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.