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Radeon RX 6800 vs Radeon RX 6900 XT

Intro

The Radeon RX 6800 comes with a GPU clock speed of 1700 MHz, and the 16384 MB of GDDR6 memory runs at 2000 MHz through a 256-bit bus. It also features 3840 SPUs, 240 TAUs, and 96 Raster Operation Units.

Compare those specifications to the Radeon RX 6900 XT, which comes with a clock frequency of 1825 MHz and a GDDR6 memory speed of 2000 MHz. It also features a 256-bit bus, and uses a 7 nm design. It is made up of 5120 SPUs, 320 Texture Address Units, and 128 ROPs.

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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 memory bandwidth, so in theory they should perform the same. (explain)

Texel Rate

The Radeon RX 6900 XT should be a lot (more or less 43%) more effective 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

If running with a high resolution is important to you, then the Radeon RX 6900 XT is superior to the Radeon RX 6800, and very much so. (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 largest amount of data (measured in MB per second) that can be transferred past the external memory interface in a second. It is worked out by multiplying the bus width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units of the card by the core speed of the chip. The better this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip 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 - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the 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 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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