Radeon RX 6900 XT vs Radeon RX Vega 64

Intro

Compare those specs to the Radeon RX Vega 64, which comes with 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 is made up of 4096 Stream Processors, 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 6900 XT		300 Watts
	Difference: 5 Watts (2%)

Memory Bandwidth

As far as performance goes, the Radeon RX 6900 XT should in theory be a small bit superior to the Radeon RX Vega 64 overall. (explain)

Radeon RX 6900 XT		524288 MB/sec
Radeon RX Vega 64		495411 MB/sec
	Difference: 28877 (6%)

Texel Rate

The Radeon RX 6900 XT is quite a bit (approximately 83%) more effective at texture filtering than the Radeon RX Vega 64. (explain)

Radeon RX 6900 XT		584000 Mtexels/sec
Radeon RX Vega 64		319232 Mtexels/sec
	Difference: 264768 (83%)

Pixel Rate

The Radeon RX 6900 XT will be quite a bit (about 193%) better at AA than the Radeon RX Vega 64, and also should be able to handle higher resolutions without slowing down too much. (explain)

Radeon RX 6900 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 megabytes per second) that can be transported past the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the 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 in one second. This figure 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 one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.