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Radeon RX 6800 vs Radeon RX 6900 XT

Intro

The Radeon RX 6800 uses a 7 nm design. AMD has clocked the core frequency at 1700 MHz. The GDDR6 memory runs at a speed of 2000 MHz on this model. It features 3840 SPUs as well as 240 Texture Address Units and 96 Rasterization Operator Units.

Compare all of that to the Radeon RX 6900 XT, which features a clock speed of 1825 MHz and a GDDR6 memory speed of 2000 MHz. It also uses a 256-bit memory bus, and makes use of a 7 nm design. It is made up of 5120 SPUs, 320 Texture Address Units, and 128 Raster Operation 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 exactly the same memory bandwidth, so in theory they should have identical performance. (explain)

Texel Rate

The Radeon RX 6900 XT should be quite a bit (more or less 43%) better at texture filtering than the Radeon RX 6800. (explain)

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

Pixel Rate

The Radeon RX 6900 XT will be a lot (about 43%) more effective at FSAA than the Radeon RX 6800, and also will be capable of handling higher resolutions better. (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: Bandwidth is the max amount of information (counted in MB per second) that can be transferred over the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, 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 amount of texture map elements (texels) that are applied in one second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the most pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to 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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