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Radeon RX 6800 XT vs Radeon RX Vega 64

Intro

The Radeon RX 6800 XT uses a 7 nm design. AMD has set the core speed at 1825 MHz. The GDDR6 memory is set to run at a frequency of 2000 MHz on this model. It features 4608 SPUs along with 288 Texture Address Units and 128 Rasterization Operator Units.

Compare those specifications to the Radeon RX Vega 64, which has 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 comprised of 4096 SPUs, 256 Texture Address Units, and 64 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX Vega 64 295 Watts
Radeon RX 6800 XT 300 Watts
Difference: 5 Watts (2%)

Memory Bandwidth

Theoretically, the Radeon RX 6800 XT should perform just a bit faster than the Radeon RX Vega 64 in general. (explain)

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

Texel Rate

The Radeon RX 6800 XT will be much (approximately 65%) faster with regards to anisotropic filtering than the Radeon RX Vega 64. (explain)

Radeon RX 6800 XT 525600 Mtexels/sec
Radeon RX Vega 64 319232 Mtexels/sec
Difference: 206368 (65%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon RX 6800 XT is a better choice, and very much so. (explain)

Radeon RX 6800 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

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Radeon RX 6800 XT

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 XT 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 1825 MHz 1247 MHz
Memory Speed 2000 GB/s 1890 MHz
Power (Max TDP) 300 watts 295 watts
Bandwidth 524288 MB/sec 495411 MB/sec
Texel Rate 525600 Mtexels/sec 319232 Mtexels/sec
Pixel Rate 233600 Mpixels/sec 79808 Mpixels/sec
Unified Shaders 4608 4096
Texture Mapping Units 288 256
Render Output Units 128 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: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the bus width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 once 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 anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This number 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 handling 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 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 the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon RX 6800 XT

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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