Radeon RX 6800 XT vs Radeon RX Vega 64

Intro

Compare those specs to the Radeon RX Vega 64, which comes with GPU clock speed of 1247 MHz, and 8192 MB of HBM2 RAM set to run at 1890 MHz through a 2048-bit bus. It also is made up of 4096 SPUs, 256 Texture Address Units, and 64 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX Vega 64		295 Watts
Radeon RX 6800 XT		300 Watts
	Difference: 5 Watts (2%)

Memory Bandwidth

The Radeon RX 6800 XT, in theory, should be a little bit faster than the Radeon RX Vega 64 overall. (explain)

Radeon RX 6800 XT		524288 MB/sec
Radeon RX Vega 64		495411 MB/sec
	Difference: 28877 (6%)

Texel Rate

The Radeon RX 6800 XT is much (more or less 65%) better at anisotropic filtering than the Radeon RX Vega 64. (explain)

Radeon RX 6800 XT		525600 Mtexels/sec
Radeon RX Vega 64		319232 Mtexels/sec
	Difference: 206368 (65%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon RX 6800 XT is the winner, by far. (explain)

Radeon RX 6800 XT		233600 Mpixels/sec
Radeon RX Vega 64		79808 Mpixels/sec
	Difference: 153792 (193%)

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 data (counted in megabytes per second) that can be transferred across the external memory interface in one second. It's worked out by multiplying the interface width by its memory clock speed. If it uses DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This number is calculated by multiplying the total amount of texture units of the card 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 processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.