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Radeon RX 6800 vs Radeon RX Vega 64

Intro

The Radeon RX 6800 comes with a core clock speed of 1700 MHz and a GDDR6 memory frequency of 2000 MHz. It also uses a 256-bit memory bus, and makes use of a 7 nm design. It is comprised of 3840 SPUs, 240 Texture Address Units, and 96 Raster Operation Units.

Compare those specifications to the Radeon RX Vega 64, which has GPU core speed of 1247 MHz, and 8192 MB of HBM2 RAM running at 1890 MHz through a 2048-bit bus. It also features 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 6800 250 Watts
Radeon RX Vega 64 295 Watts
Difference: 45 Watts (18%)

Memory Bandwidth

Theoretically, the Radeon RX 6800 should perform a bit faster than the Radeon RX Vega 64 overall. (explain)

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

Texel Rate

The Radeon RX 6800 should be much (more or less 28%) better at anisotropic 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

If using high levels of AA is important to you, then the Radeon RX 6800 is superior to the Radeon RX Vega 64, and very much so. (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

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Radeon RX 6800

Amazon.com

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Radeon RX Vega 64

Amazon.com

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Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon RX 6800 Radeon RX Vega 64
Manufacturer AMD AMD
Year November 2020 August 2017
Code Name Navi 21 Vega 10 XT
Memory 16384 MB 8192 MB
Core Speed 1700 MHz 1247 MHz
Memory Speed 2000 GB/s 1890 MHz
Power (Max TDP) 250 watts 295 watts
Bandwidth 524288 MB/sec 495411 MB/sec
Texel Rate 408000 Mtexels/sec 319232 Mtexels/sec
Pixel Rate 163200 Mpixels/sec 79808 Mpixels/sec
Unified Shaders 3840 4096
Texture Mapping Units 240 256
Render Output Units 96 64
Bus Type GDDR6 HBM2
Bus Width 256-bit 2048-bit
Fab Process 7 nm 14 nm
Transistors 26800 million 12500 million
Bus PCIe 4.0 x16 PCIe 3.0 x16
DirectX Version DirectX 12 DirectX 12.0
OpenGL Version OpenGL 4.6 OpenGL 4.5

Memory Bandwidth: Memory bandwidth is the largest amount of information (counted in megabytes per second) that can be transported past the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory speed. In the case of DDR type RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. The figure is worked out 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 output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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Radeon RX 6800

Amazon.com

Check prices at:

Radeon RX Vega 64

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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