Radeon HD 7870 XT vs Radeon RX 6800

Intro

Compare those specs to the Radeon RX 6800, which comes with GPU core speed of 1700 MHz, and 16384 MB of GDDR6 memory set to run at 2000 MHz through a 256-bit bus. It also is comprised of 3840 SPUs, 240 Texture Address Units, and 96 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		250 Watts
	Difference: 65 Watts (35%)

Memory Bandwidth

Theoretically speaking, the Radeon RX 6800 will be 173% quicker than the Radeon HD 7870 XT in general, because of its higher data rate. (explain)

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

Texel Rate

The Radeon RX 6800 should be quite a bit (more or less 359%) better at AF than the Radeon HD 7870 XT. (explain)

Radeon RX 6800		408000 Mtexels/sec
Radeon HD 7870 XT		88800 Mtexels/sec
	Difference: 319200 (359%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon RX 6800 is a better choice, and very much so. (explain)

Radeon RX 6800		163200 Mpixels/sec
Radeon HD 7870 XT		29600 Mpixels/sec
	Difference: 133600 (451%)

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 (counted in MB per second) that can be transported past the external memory interface within a second. It is worked out by multiplying the interface width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs 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 fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.