Radeon RX 6800 XT vs Radeon RX Vega 64

Intro

Compare all that to the Radeon RX Vega 64, which has 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 features 4096 Stream Processors, 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

The Radeon RX 6800 XT should in theory perform just a bit faster than the Radeon RX Vega 64 in general. (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 much (about 65%) more effective at 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 should be quite a bit (approximately 193%) more effective at AA than the Radeon RX Vega 64, and capable of handling higher screen resolutions more effectively. (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 max amount of information (in units of MB per second) that can be moved across the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster 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 number of texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to the local memory in one 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 drawing the pixels (image) on the screen. The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.