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Radeon RX 6800 vs Radeon VII

Intro

The Radeon RX 6800 comes with a GPU core clock speed of 1700 MHz, and the 16384 MB of GDDR6 RAM runs at 2000 MHz through a 256-bit bus. It also is made up of 3840 SPUs, 240 TAUs, and 96 ROPs.

Compare those specifications to the Radeon VII, which has a core clock speed of 1400 MHz and a HBM2 memory frequency of 1000 MHz. It also makes use of a 4096-bit memory bus, and makes use of a 7 nm design. It features 3840 SPUs, 240 TAUs, and 64 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

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

Memory Bandwidth

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

Radeon VII 1048576 MB/sec
Radeon RX 6800 524288 MB/sec
Difference: 524288 (100%)

Texel Rate

The Radeon RX 6800 will be a lot (about 21%) better at anisotropic filtering than the Radeon VII. (explain)

Radeon RX 6800 408000 Mtexels/sec
Radeon VII 336000 Mtexels/sec
Difference: 72000 (21%)

Pixel Rate

The Radeon RX 6800 will be a lot (about 82%) better at anti-aliasing than the Radeon VII, and also capable of handling higher resolutions while still performing well. (explain)

Radeon RX 6800 163200 Mpixels/sec
Radeon VII 89600 Mpixels/sec
Difference: 73600 (82%)

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

Check prices at:

Radeon VII

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 Radeon VII
Manufacturer AMD AMD
Year November 2020 2019
Code Name Navi 21 Vega 20 XT
Memory 16384 MB 16384 MB
Core Speed 1700 MHz 1400 MHz
Memory Speed 2000 GB/s 1000 MHz
Power (Max TDP) 250 watts 295 watts
Bandwidth 524288 MB/sec 1048576 MB/sec
Texel Rate 408000 Mtexels/sec 336000 Mtexels/sec
Pixel Rate 163200 Mpixels/sec 89600 Mpixels/sec
Unified Shaders 3840 3840
Texture Mapping Units 240 240
Render Output Units 96 64
Bus Type GDDR6 HBM2
Bus Width 256-bit 4096-bit
Fab Process 7 nm 7 nm
Transistors 26800 million 13230 million
Bus PCIe 4.0 x16 PCIe 3.0 x16
DirectX Version DirectX 12 DirectX 12
OpenGL Version OpenGL 4.6 OpenGL 4.6

Memory Bandwidth: Bandwidth is the largest amount of information (in units of megabytes per second) that can be transferred across the external memory interface in one second. It is worked out by multiplying the card's interface width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the graphics 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 maximum amount of pixels that the graphics chip can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.

Display Prices

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Radeon RX 6800

Amazon.com

Check prices at:

Radeon VII

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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