Radeon HD 7870 XT vs Radeon RX 6900 XT

Intro

Compare all of that to the Radeon RX 6900 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 5120 SPUs as well as 320 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 6900 XT		300 Watts
	Difference: 115 Watts (62%)

Memory Bandwidth

Performance-wise, the Radeon RX 6900 XT should in theory be a lot better than the Radeon HD 7870 XT in general. (explain)

Radeon RX 6900 XT		524288 MB/sec
Radeon HD 7870 XT		192000 MB/sec
	Difference: 332288 (173%)

Texel Rate

The Radeon RX 6900 XT will be much (approximately 558%) faster with regards to anisotropic filtering than the Radeon HD 7870 XT. (explain)

Radeon RX 6900 XT		584000 Mtexels/sec
Radeon HD 7870 XT		88800 Mtexels/sec
	Difference: 495200 (558%)

Pixel Rate

The Radeon RX 6900 XT will be a lot (more or less 689%) better at full screen anti-aliasing than the Radeon HD 7870 XT, and should be capable of handling higher resolutions without losing too much performance. (explain)

Radeon RX 6900 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 largest amount of information (counted in megabytes per second) that can be transferred across the external memory interface within a second. It's worked out by multiplying the interface width by its memory clock speed. In the case of DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR 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 is worked out by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). 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 ability to reach the maximum fill rate.