Radeon HD 7870 XT vs Radeon RX 6800

Intro

Compare those specifications to the Radeon RX 6800, which comes with core speeds of 1700 MHz on the GPU, and 2000 MHz on the 16384 MB of GDDR6 memory. It features 3840 SPUs along with 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

The Radeon RX 6800 should theoretically be much faster than the Radeon HD 7870 XT overall. (explain)

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

Texel Rate

The Radeon RX 6800 will be much (approximately 359%) faster with regards to texture filtering 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

The Radeon RX 6800 should be much (about 451%) faster with regards to anti-aliasing than the Radeon HD 7870 XT, and also capable of handling higher screen resolutions without losing too much performance. (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: Memory bandwidth is the max amount of data (measured in MB per second) that can be transported past the external memory interface in a second. The number is worked out by multiplying the bus width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's 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 texture map elements (texels) that are applied per second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to its 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 clock 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 potential to get to the maximum fill rate.