Radeon RX 6800 XT vs Radeon RX 7900 XT

Intro

Compare all of that to the Radeon RX 7900 XT, which features a clock frequency of 1500 MHz and a GDDR6 memory speed of 2500 MHz. It also makes use of a 320-bit bus, and makes use of a 5 nm design. It is comprised of 5376 SPUs, 336 Texture Address Units, and 192 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Theoretically, the Radeon RX 7900 XT should perform quite a bit faster than the Radeon RX 6800 XT overall. (explain)

Radeon RX 7900 XT		819200 MB/sec
Radeon RX 6800 XT		524288 MB/sec
	Difference: 294912 (56%)

Texel Rate

The Radeon RX 6800 XT should be just a bit (more or less 4%) better at AF than the Radeon RX 7900 XT. (explain)

Radeon RX 6800 XT		525600 Mtexels/sec
Radeon RX 7900 XT		504000 Mtexels/sec
	Difference: 21600 (4%)

Pixel Rate

The Radeon RX 7900 XT is a lot (approximately 23%) better at AA than the Radeon RX 6800 XT, and also able to handle higher screen resolutions while still performing well. (explain)

Radeon RX 7900 XT		288000 Mpixels/sec
Radeon RX 6800 XT		233600 Mpixels/sec
	Difference: 54400 (23%)

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 (counted in MB per second) that can be moved across the external memory interface in a second. It is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better 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 in one second. This is worked out by multiplying the total number of 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 maximum amount of pixels the video card can possibly record to the local memory per 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 speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.