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Radeon RX 6800 XT vs Radeon RX Vega 64

Intro

The Radeon RX 6800 XT comes with a core clock frequency of 1825 MHz and a GDDR6 memory frequency of 2000 MHz. It also uses a 256-bit bus, and makes use of a 7 nm design. It is made up of 4608 SPUs, 288 Texture Address Units, and 128 Raster Operation Units.

Compare all of that to the Radeon RX Vega 64, which has GPU clock 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 TAUs, and 64 Raster Operation Units.

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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

The Radeon RX 6800 XT should theoretically perform a small bit faster than the Radeon RX Vega 64 overall. (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%) more effective at texture 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

The Radeon RX 6800 XT will be much (approximately 193%) faster with regards to full screen anti-aliasing than the Radeon RX Vega 64, and capable of handling higher screen resolutions more effectively. (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

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.

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 largest amount of information (in units of megabytes per second) that can be moved across the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This figure 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 video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

Hide Prices

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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