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Radeon RX 6800 XT vs Radeon RX 6900 XT

Intro

The Radeon RX 6800 XT has core speeds of 1825 MHz on the GPU, and 2000 MHz on the 16384 MB of GDDR6 RAM. It features 4608 SPUs as well as 288 TAUs and 128 Rasterization Operator Units.

Compare those specs 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 memory is set to run at a frequency of 2000 MHz on this card. It features 5120 SPUs along with 320 Texture Address Units and 128 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

Both cards have exactly the same memory bandwidth, so in theory they should have identical performance. (explain)

Texel Rate

The Radeon RX 6900 XT will be a bit (approximately 11%) more effective at texture filtering than the Radeon RX 6800 XT. (explain)

Radeon RX 6900 XT 584000 Mtexels/sec
Radeon RX 6800 XT 525600 Mtexels/sec
Difference: 58400 (11%)

Pixel Rate

Both cards have the exact same pixel fill rate, so in theory they should be equally good at at full screen anti-aliasing, and be capable of handling the same screen resolutions. (explain)

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 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 XT Radeon RX 6900 XT
Manufacturer AMD AMD
Year November 2020 2020
Code Name Navi 21 Navi 21
Memory 16384 MB 16384 MB
Core Speed 1825 MHz 1825 MHz
Memory Speed 2000 GB/s 2000 GB/s
Power (Max TDP) 300 watts 300 watts
Bandwidth 524288 MB/sec 524288 MB/sec
Texel Rate 525600 Mtexels/sec 584000 Mtexels/sec
Pixel Rate 233600 Mpixels/sec 233600 Mpixels/sec
Unified Shaders 4608 5120
Texture Mapping Units 288 320
Render Output Units 128 128
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: Bandwidth is the largest amount of data (counted in megabytes per second) that can be transferred over the external memory interface in a second. It's worked out by multiplying the card's interface width by the speed of its memory. If the card has 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 texture map elements (texels) that can be processed per second. This number is calculated by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

Hide Prices

Radeon RX 6800 XT

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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