Radeon R9 270X vs Radeon RX 6800 XT

Intro

Compare those specifications to the Radeon RX 6800 XT, which comes with GPU clock speed of 1825 MHz, and 16384 MB of GDDR6 memory set to run at 2000 MHz through a 256-bit bus. It also is made up of 4608 SPUs, 288 TAUs, and 128 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 270X		180 Watts
Radeon RX 6800 XT		300 Watts
	Difference: 120 Watts (67%)

Memory Bandwidth

The Radeon RX 6800 XT should in theory be quite a bit faster than the Radeon R9 270X overall. (explain)

Radeon RX 6800 XT		524288 MB/sec
Radeon R9 270X		179200 MB/sec
	Difference: 345088 (193%)

Texel Rate

The Radeon RX 6800 XT is much (more or less 557%) more effective at AF than the Radeon R9 270X. (explain)

Radeon RX 6800 XT		525600 Mtexels/sec
Radeon R9 270X		80000 Mtexels/sec
	Difference: 445600 (557%)

Pixel Rate

The Radeon RX 6800 XT should be a lot (about 630%) better at full screen anti-aliasing than the Radeon R9 270X, and also will be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon RX 6800 XT		233600 Mpixels/sec
Radeon R9 270X		32000 Mpixels/sec
	Difference: 201600 (630%)

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 maximum amount of data (counted in MB per second) that can be moved across the external memory interface within a second. The number is calculated 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 it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen 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 of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one 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. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.