Radeon R9 285 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 memory. It features 5120 SPUs along with 320 TAUs and 128 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 285		190 Watts
Radeon RX 6900 XT		300 Watts
	Difference: 110 Watts (58%)

Memory Bandwidth

In theory, the Radeon RX 6900 XT should be 198% quicker than the Radeon R9 285 overall, due to its greater bandwidth. (explain)

Radeon RX 6900 XT		524288 MB/sec
Radeon R9 285		176000 MB/sec
	Difference: 348288 (198%)

Texel Rate

The Radeon RX 6900 XT is quite a bit (approximately 468%) better at AF than the Radeon R9 285. (explain)

Radeon RX 6900 XT		584000 Mtexels/sec
Radeon R9 285		102816 Mtexels/sec
	Difference: 481184 (468%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon RX 6900 XT is superior to the Radeon R9 285, by a large margin. (explain)

Radeon RX 6900 XT		233600 Mpixels/sec
Radeon R9 285		29376 Mpixels/sec
	Difference: 204224 (695%)

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 (in units of megabytes per second) that can be transferred across the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. In the case of DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.