Radeon HD 7970 vs Radeon RX 6800 XT

Intro

Compare all that to the Radeon RX 6800 XT, which has core speeds of 1825 MHz on the GPU, and 2000 MHz on the 16384 MB of GDDR6 RAM. It features 4608 SPUs as well as 288 Texture Address Units and 128 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7970		250 Watts
Radeon RX 6800 XT		300 Watts
	Difference: 50 Watts (20%)

Memory Bandwidth

As far as performance goes, the Radeon RX 6800 XT should theoretically be a lot superior to the Radeon HD 7970 overall. (explain)

Radeon RX 6800 XT		524288 MB/sec
Radeon HD 7970		264000 MB/sec
	Difference: 260288 (99%)

Texel Rate

The Radeon RX 6800 XT is much (more or less 344%) more effective at AF than the Radeon HD 7970. (explain)

Radeon RX 6800 XT		525600 Mtexels/sec
Radeon HD 7970		118400 Mtexels/sec
	Difference: 407200 (344%)

Pixel Rate

The Radeon RX 6800 XT is a lot (more or less 689%) better at full screen anti-aliasing than the Radeon HD 7970, and also should be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon RX 6800 XT		233600 Mpixels/sec
Radeon HD 7970		29600 Mpixels/sec
	Difference: 204000 (689%)

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 information (counted in MB per second) that can be moved across the external memory interface within a second. It's calculated by multiplying the interface width by its memory speed. 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 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 can be processed in one second. This figure is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.