Radeon RX 6800 vs Radeon RX Vega 64

Intro

Compare all of that to the Radeon RX Vega 64, which features core speeds of 1247 MHz on the GPU, and 1890 MHz on the 8192 MB of HBM2 memory. It features 4096 SPUs along with 256 TAUs and 64 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6800		250 Watts
Radeon RX Vega 64		295 Watts
	Difference: 45 Watts (18%)

Memory Bandwidth

Theoretically speaking, the Radeon RX 6800 should be 6% quicker than the Radeon RX Vega 64 in general, due to its greater bandwidth. (explain)

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

Texel Rate

The Radeon RX 6800 is a lot (about 28%) faster with regards to texture filtering than the Radeon RX Vega 64. (explain)

Radeon RX 6800		408000 Mtexels/sec
Radeon RX Vega 64		319232 Mtexels/sec
	Difference: 88768 (28%)

Pixel Rate

The Radeon RX 6800 is much (approximately 104%) faster with regards to anti-aliasing than the Radeon RX Vega 64, and able to handle higher screen resolutions better. (explain)

Radeon RX 6800		163200 Mpixels/sec
Radeon RX Vega 64		79808 Mpixels/sec
	Difference: 83392 (104%)

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 data (in units of megabytes per second) that can be moved over the external memory interface in one second. It's calculated by multiplying the interface width by its memory clock speed. If it uses DDR type RAM, it must be multiplied by 2 once again. If 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 amount of texture map elements (texels) that can be processed 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 better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the clock 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 memory bandwidth is, the lower the ability to get to the max fill rate.