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Radeon RX 6800 vs Radeon RX 6900 XT

Intro

The Radeon RX 6800 makes use of a 7 nm design. AMD has set the core frequency at 1700 MHz. The GDDR6 memory is set to run at a speed of 2000 MHz on this specific card. It features 3840 SPUs as well as 240 TAUs and 96 ROPs.

Compare those specifications to the Radeon RX 6900 XT, which makes use of a 7 nm design. AMD has set the core speed at 1825 MHz. The GDDR6 RAM works at a frequency of 2000 MHz on this card. It features 5120 SPUs along with 320 TAUs and 128 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX 6800 250 Watts
Radeon RX 6900 XT 300 Watts
Difference: 50 Watts (20%)

Memory Bandwidth

Both cards have the exact same bandwidth, so theoretically they should perform the same. (explain)

Texel Rate

The Radeon RX 6900 XT is much (more or less 43%) faster with regards to AF than the Radeon RX 6800. (explain)

Radeon RX 6900 XT 584000 Mtexels/sec
Radeon RX 6800 408000 Mtexels/sec
Difference: 176000 (43%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon RX 6900 XT is the winner, by far. (explain)

Radeon RX 6900 XT 233600 Mpixels/sec
Radeon RX 6800 163200 Mpixels/sec
Difference: 70400 (43%)

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 RX 6900 XT

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 RX 6900 XT
Manufacturer AMD AMD
Year November 2020 2020
Code Name Navi 21 Navi 21
Memory 16384 MB 16384 MB
Core Speed 1700 MHz 1825 MHz
Memory Speed 2000 GB/s 2000 GB/s
Power (Max TDP) 250 watts 300 watts
Bandwidth 524288 MB/sec 524288 MB/sec
Texel Rate 408000 Mtexels/sec 584000 Mtexels/sec
Pixel Rate 163200 Mpixels/sec 233600 Mpixels/sec
Unified Shaders 3840 5120
Texture Mapping Units 240 320
Render Output Units 96 128
Bus Type GDDR6 GDDR6
Bus Width 256-bit 256-bit
Fab Process 7 nm 7 nm
Transistors 26800 million 26800 million
Bus PCIe 4.0 x16 PCIe 4.0 x16
DirectX Version DirectX 12 DirectX 12
OpenGL Version OpenGL 4.6 OpenGL 4.6

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in MB per second) that can be transferred over the external memory interface in a second. It's worked out by multiplying the card's bus width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster 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 number of texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total amount of texture units of the card 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 per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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Radeon RX 6800

Amazon.com

Check prices at:

Radeon RX 6900 XT

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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