Radeon RX 6800 XT vs Radeon RX Vega 64

Intro

Compare all that to the Radeon RX Vega 64, which features GPU core speed of 1247 MHz, and 8192 MB of HBM2 memory set to run at 1890 MHz through a 2048-bit bus. It also features 4096 SPUs, 256 Texture Address Units, and 64 Raster Operation Units.

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

Theoretically, the Radeon RX 6800 XT should be just a 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 should be a lot (approximately 65%) faster with regards to texture 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

The Radeon RX 6800 XT is a lot (more or less 193%) better at anti-aliasing than the Radeon RX Vega 64, and also will be capable of handling higher screen resolutions better. (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: Memory bandwidth is the largest amount of data (counted in MB per second) that can be transported over the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This is calculated by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the video 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 amount of pixels the video 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 Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.