Radeon RX 6800 XT vs Radeon RX 7900 XTX

Intro

Compare those specifications to the Radeon RX 7900 XTX, which has a core clock speed of 1855 MHz and a GDDR6 memory frequency of 2500 MHz. It also features a 384-bit bus, and uses a 5 nm design. It is comprised of 6144 SPUs, 384 Texture Address Units, and 192 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6800 XT		300 Watts
Radeon RX 7900 XTX		355 Watts
	Difference: 55 Watts (18%)

Memory Bandwidth

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

Radeon RX 7900 XTX		983040 MB/sec
Radeon RX 6800 XT		524288 MB/sec
	Difference: 458752 (88%)

Texel Rate

The Radeon RX 7900 XTX should be a lot (about 36%) more effective at texture filtering than the Radeon RX 6800 XT. (explain)

Radeon RX 7900 XTX		712320 Mtexels/sec
Radeon RX 6800 XT		525600 Mtexels/sec
	Difference: 186720 (36%)

Pixel Rate

The Radeon RX 7900 XTX is quite a bit (more or less 52%) better at anti-aliasing than the Radeon RX 6800 XT, and will be capable of handling higher resolutions more effectively. (explain)

Radeon RX 7900 XTX		356160 Mpixels/sec
Radeon RX 6800 XT		233600 Mpixels/sec
	Difference: 122560 (52%)

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 max amount of information (in units of MB per second) that can be transferred past the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 once 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, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one 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 graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

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