Radeon HD 7870 XT vs Radeon RX 6800 XT

Intro

Compare all of that to the Radeon RX 6800 XT, which comes with core clock speeds of 1825 MHz on the GPU, and 2000 MHz on the 16384 MB of GDDR6 RAM. It features 4608 SPUs along with 288 TAUs and 128 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7870 XT		185 Watts
Radeon RX 6800 XT		300 Watts
	Difference: 115 Watts (62%)

Memory Bandwidth

Theoretically speaking, the Radeon RX 6800 XT should perform much faster than the Radeon HD 7870 XT overall. (explain)

Radeon RX 6800 XT		524288 MB/sec
Radeon HD 7870 XT		192000 MB/sec
	Difference: 332288 (173%)

Texel Rate

The Radeon RX 6800 XT should be a lot (approximately 492%) more effective at anisotropic filtering than the Radeon HD 7870 XT. (explain)

Radeon RX 6800 XT		525600 Mtexels/sec
Radeon HD 7870 XT		88800 Mtexels/sec
	Difference: 436800 (492%)

Pixel Rate

The Radeon RX 6800 XT will be a lot (about 689%) more effective at anti-aliasing than the Radeon HD 7870 XT, and also will be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon RX 6800 XT		233600 Mpixels/sec
Radeon HD 7870 XT		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 maximum amount of information (counted in megabytes per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes 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, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.