Radeon RX 6900 XT vs Radeon RX Vega 64

Intro

Compare those specifications to the Radeon RX Vega 64, which has a clock frequency of 1247 MHz and a HBM2 memory frequency of 1890 MHz. It also features a 2048-bit memory bus, and uses a 14 nm design. It is comprised 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 6900 XT		300 Watts
	Difference: 5 Watts (2%)

Memory Bandwidth

The Radeon RX 6900 XT, in theory, should be a small bit faster than the Radeon RX Vega 64 in general. (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 will be quite a bit (more or less 83%) faster with regards to AF 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

If running with lots of anti-aliasing is important to you, then the Radeon RX 6900 XT is superior to the Radeon RX Vega 64, by a large margin. (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: Bandwidth is the max amount of data (measured in megabytes per second) that can be transferred across the external memory interface in one second. It's worked out by multiplying the bus width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the 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 most pixels that the graphics chip 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 clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.