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Radeon R9 285 vs Radeon RX 6800

Intro

The Radeon R9 285 features a core clock frequency of 918 MHz and a GDDR5 memory speed of 1375 MHz. It also uses a 256-bit bus, and uses a 28 nm design. It is comprised of 1792 SPUs, 112 Texture Address Units, and 32 Raster Operation Units.

Compare all of that to the Radeon RX 6800, which has GPU core speed of 1700 MHz, and 16384 MB of GDDR6 memory set to run at 2000 MHz through a 256-bit bus. It also is comprised of 3840 Stream Processors, 240 Texture Address Units, and 96 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 285 190 Watts
Radeon RX 6800 250 Watts
Difference: 60 Watts (32%)

Memory Bandwidth

Performance-wise, the Radeon RX 6800 should in theory be quite a bit better than the Radeon R9 285 in general. (explain)

Radeon RX 6800 524288 MB/sec
Radeon R9 285 176000 MB/sec
Difference: 348288 (198%)

Texel Rate

The Radeon RX 6800 will be much (about 297%) faster with regards to anisotropic filtering than the Radeon R9 285. (explain)

Radeon RX 6800 408000 Mtexels/sec
Radeon R9 285 102816 Mtexels/sec
Difference: 305184 (297%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon RX 6800 is superior to the Radeon R9 285, and very much so. (explain)

Radeon RX 6800 163200 Mpixels/sec
Radeon R9 285 29376 Mpixels/sec
Difference: 133824 (456%)

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 R9 285

Amazon.com

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Radeon RX 6800

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 R9 285 Radeon RX 6800
Manufacturer AMD AMD
Year September 2014 November 2020
Code Name Tonga PRO Navi 21
Memory 2048 MB 16384 MB
Core Speed 918 MHz 1700 MHz
Memory Speed 5500 MHz 4000 GB/s
Power (Max TDP) 190 watts 250 watts
Bandwidth 176000 MB/sec 524288 MB/sec
Texel Rate 102816 Mtexels/sec 408000 Mtexels/sec
Pixel Rate 29376 Mpixels/sec 163200 Mpixels/sec
Unified Shaders 1792 3840
Texture Mapping Units 112 240
Render Output Units 32 96
Bus Type GDDR5 GDDR6
Bus Width 256-bit 256-bit
Fab Process 28 nm 7 nm
Transistors 5000 million 26800 million
Bus PCIe 3.0 x16 PCIe 4.0 x16
DirectX Version DirectX 12.0 DirectX 12
OpenGL Version OpenGL 4.4 OpenGL 4.6

Memory Bandwidth: Bandwidth is the largest amount of data (in units of MB per second) that can be moved past the external memory interface in a second. The number is worked out by multiplying the bus width by its memory clock 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 better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range 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 calculated by multiplying the total texture units by the core 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 most pixels that the graphics chip could possibly write to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core 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 output rate also depends 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 max fill rate.

Display Prices

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Radeon R9 285

Amazon.com

Check prices at:

Radeon RX 6800

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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