Radeon RX 6800 vs Radeon RX Vega 64

Intro

Compare that to the Radeon RX Vega 64, which makes use of a 14 nm design. AMD has set the core frequency at 1247 MHz. The HBM2 RAM works at a speed of 1890 MHz on this specific model. It features 4096 SPUs along with 256 Texture Address Units and 64 ROPs.

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

In theory, the Radeon RX 6800 will be 6% faster than the Radeon RX Vega 64 in general, because of its greater data rate. (explain)

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

Texel Rate

The Radeon RX 6800 is quite a bit (more or less 28%) more effective at AF 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 should be much (about 104%) faster with regards to AA than the Radeon RX Vega 64, and also should be capable of handling higher resolutions without losing too much performance. (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 information (counted in megabytes per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the interface width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better 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 texture map elements (texels) that are processed per second. This is calculated by multiplying the total 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few 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.